Multitrack problem with different track length?

Dear Laszlo,

thank you for trying to help. I have sending you an email with links where you can download a) all original .wav files we have exported with uTool and also b) the single exported .wav file uTrack24 is using. It would be REALLY good to understand what eventually went wrong when we exported the files for uTrack24.
I also opened the uTrack .wav file in ProTools. And even if it does not show all waveforms of all tracks, ONE waveform shows exactly the problem at the end, where an earlier sector of the track was unconditional repeating again at the end – which was NOT in the original file like that!
Please do also see the attached picture file, where you can see it clearly.

Thanks you for your efforts
regards
-Axel-