It is a rackmount meter higher resolution (though not perfect, about 40 LEDs or so) but the key thing is when compressor mix is at zero both channels are the same, when compressor mix is up the difference occurs.
Iād change all leds. 
Another metering way : OT outputs to inputs A and C, and check with noise gateā¦
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I just sampled it, then mix channels, subtract L-R, completely cancel. 
But what is still puzzling me why the meter was showing a difference, depending on compressor mix.
Time to call Mulder and Scully? 
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Do you observe the same thing with unbalanced cables?
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Yes. Balanced or unbalanced the same, I will try swapping L+R cables to see what happens.
Edit: Swapping cable indicates problem is with meter, rather than OT, I canāt think of a rational reason though.
I will recalibrate the meter, even though it is showing exact same level when compressor is at zero mix, and also the compressor is set to be reducing overall gain, so the more mix the lower the signal.
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I say this because I noticed a similar behavior with Empress Reverb, that doesnāt accept balanced signals (Empress told me).
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Ballistics maybe? If the response time o fone of the meter channels is a little off, I could see the changes in the dynamics of the audio affecting the way the channels of the meter reacted differently, but then Iād also expect both channels to look different with no compression, too. But you never know.
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Yes! Could well be down to component tolerances in the meter, it isnāt a premium product, not sure how it works inside but I suspect it uses LM3196 display drivers or similar, and if the input circuitry is slightly different between the left and right channels it could result in a slight lag on the fast transients that the compressor is adding. I think I will test with a slower sound/setting.
Good catch @Supercolor_T-120 
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This is related to the scene 2 issue mentioned above. Thereās an interference issue on some of the ui boards that theyāre working on an firmware fix to filter the cross talk out.
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Youāre still ahead of me, the closest thing to proper meters I have ar eon an old Otari reel to reel I got for $20 back in the mid 2000s when nobody wanted them, and i figure they havenāt been calibrated since at least 1995.
Iād do it myself, except all the test equipment I have probably hasnāt been calibrated since the 80s so whatās the point?
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Quick follow up, definitely some component tolerance issue in the meter, the discrepancy between right and left disappears when the compressor does not have such a fast attack, once I set it to about 50 the meter behaves as expected, with both channels equal.
Interesting though, and may save someone in the future some trouble shooting.
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Edit: the weird behaviour below was not found by others. It appears to be an after effect of stuck notes (which is a bit of an issue with OT current firmware it seemsā¦)
Uh so this is seems a huge bug. Could someone check if itās same for them pleaseā¦
On MIDI tracks set to channel 1 the OT can NOT send:
C#3 E3 A3 B3 C4 C#4 D4 or E4
as the track default (i.e. the NOTE setting on the Note page)
These notes can be p-locked, but donāt work on regular trigs as the track default
They work on all the other channels, but not Channel 1 on any MIDI track
Have tried eliminating any clash with the Audio tracks, starting new project etc etc but just maybe Iām missing something so a confirmation would be much appreciated. Cheers
Works for me just fine, OT MKI, OS 1.40A
I tested each note in turn from the Note page, no p-locks, from channel 1 to a synth receiving on the same channel over midi. Each one worked as expected.
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coming from plain trigs with sequence running? (not played live in chromatic trig mode)
I tested both actually. Sequencer notes working as expected. Are you running 1.40A?
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Yes - on a mk 1
Tested here on mk2 1.40A works fine here.
Edit: With trigs.
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Hereās a weird thing tooā¦
I just tried trigging those notes with trig preview (trig+yes)
It was silent first press, sounded on second and subsequent presses. After that the note was āallowedā on that one track when sequencer runs
Go to another track and it takes the āpreview x 2ā move again to get the dead notes working