Why are my erasers melting into eachother?

I have some homemade erasers and when store bought erasers make contact with it, the contact point can be ripped off and is pliable, play dough like eraser, why is this? Do the homemade erasers contain differant chemicals? Or do they possibly have too much moisture? I mean... It is fun to have this dough... But... show more I have some homemade erasers and when store bought erasers make contact with it, the contact point can be ripped off and is pliable, play dough like eraser, why is this? Do the homemade erasers contain differant chemicals? Or do they possibly have too much moisture? I mean... It is fun to have this dough... But melting eraser is very sticky and kind of a mess.
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