Showgard Mount Curling Problem

Just wondering if anyone has ever had the same problem.

I mounted group of stamps about 8 years ago with Showgard mounts. I recall at the time, that the mounts seemed to be "wavy" - not sure if they were cut too long for the packaging, but anyway, I cut them to size and used them for mounting. Turns out the curling got much worse and lifted the mounts off the pages in some cases.

Now I'm spending my half-hour per day remounting those 20 or so album pages that I got from that package of mounts.

Wow, I have never had that experience before.
But I haven't been using them for that long either.

I've seen this before. That's why I use Scott mounts.