Thanks for your fast reply, Flick. Today i have done a little investigation on this and found out that the problem was in my overall project settings in cubase. There i had the sample rate set on 48.000Hz when working on my rhythm tracks. Every other point you mentioned i had right. I had placed the locators for the output area right at full bar lengths and in the export settings i had set 16-bit res and 44.100Hz sample rate.

Then I have reimported the drum tracks that i had made before and saw that every track was a tiny bit too short (only could be seen on full zoom). This ‘shrinking’ seems to happen when audio is exported from a project that has a different sample rate from the output/export settings. Maybe this is normal but i didn’t know that. Just thought only the output settings really matter. So it was in the ‘setting up the tracks’ part as you presumed. Lesson learned.

My cubase syncs to my audio interface so i had to set the master clock in its driver settings to 44.100Hz. A bit of correction work to the old tracks and now everything is looping on the beat into eternity… thanks for helping!