I concur, sticker's fine. You can see mine is even still raised above the edge I posted in the photo, MK.
After 10mins of vaping, I wasn't able to get one loose just now without the sinking feeling it might be bad news going at it harder. That said - given the manufacturing variability, I'm sure it works at least part of the time. Also, the cap and carto wall would expand/shrink at varying rates with even a little heat - so I can see that too.