I bought a number of small sets a few years ago and every single one of them had pieces that split up the side after very little use. Strange. Our 6 y/o daught

I bought a number of small sets a few years ago and every single one of them had pieces that split up the side after very little use. Strange. Our 6 y/o daughter has really massive amounts of Lego. She started collecting them after she switched from Duplo when she was ~3. She uses them intensively and we never had a single brick or piece break or split. I wonder if there are counterfeit sets on Amazon et al?