Now that you say it, I have noticed that the cling images made some of my stamps tend to curl - especially the small ones. I didn't think the stickers were all that easy to put on, either. I remember sitting and watching demos do it on YouTube videos over and over, and making it look so easy, while I found that getting the stickers aligned perfectly with no hangover on the stamp was tricky.
I just shove the index sheet in the back of the case and use it to be sure I have all my stamps.
The real voyage of discovery consists not in seeking new lands but in seeing with new eyes...