Replacing Audio - I'm doing something wrong

I made a master yesterday - 2 tracks from one wav file.

I used the replace audio function in the montage editor today to replace the wav file and track 1 was replaced as usual. Track 2 though was replaced with the whole wav, from start.

I opened an old montage and replaced some wavs in the same manner. No problem, everything is aligned.
What am I doing wrong?

EDIT: it’s weird, it is only one montage. Now I made a new and everything is as normal. I must have clicked something by mistake…