Problem importing samples

I have a new MD UW.

I started importing samples with C6 and everything works and loads fine except samples which I sampled with my OT.

They are in 24 bit 44.1k format but I have imported other wav files from my pc in the same file format without any problems.

The samples get imported but with playback I only hear some kind of transient.

Does anyone know what the problem could be? And how I can import them?