Issue automation when OB window is opened

I experience a weird issue:
My OB automations are buggy when the OB window is opened.
Example: I create an automation in an ableton clip for the sample slot.
I play it, everything is fine. I open the OB VST windows: the automation becomes “buggy” and “glitchy”, calling different samples than originally. I close the window, back to normal. Same problem with start or end of sample …

What is the issue?
Anybody else with this problem?