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This happened to every one of my storebought cubes I've ever had. I tried fixing with super glue, but it didn't work very well. Just give and buy a DIY, or you can try your luck and buy another Rubik's brand if you think you're man enough.
Happened to mine also. Get a F-II, Haiyan Memory, and a GuHong. They own. Don't bother fixing the Rubik's brand, but keep the pieces for modding/hybrids.