Loop cut off changes despite saving

I discovered an issue tonight and made a couple of screen grabs of the problem but before I got any further I thought I'd check in with you all to see if there's something I'm missing.

I have some drum loops and the odd thing was I would drag the loops and stop them on the first quarter note in a new section. And then I would save the project.

But when I opened it up the loop stop point had changed to beat number three in the previous measure. I solved the problem by selecting all the clips and bounce to clips but this issue caught me off-guard for quite a while before I discovered it. Is there something I missing?

I've used clips like forever and this surprised me. I'm using June version of sonar Platinum