Cups go flat in 4 months and then it won't stick to the wall.

Got this at Christmas, in April it fell off the wall of my shower and when I tried to stick it back up I noticed that the cups had deformed and were not flat. I boiled them for a minute and they regained their shape, but then a week later they pulled right through the mounting holes and it bounced off the floor again. So it only lasted 4 months.

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