I have noticed my pages are bending at the bottom of the binders as well. I have taken to storing all of my binders on their backs instead of on their sides. I use the same sheets as well as some older Ultra Pro sheets as well.
I don't believe it is a problem with the sheets specifically as much as it is a problem with the sheets not being supported all that well when the binders are in an upright book type position with the spines facing outward. JMHO.
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