Funky collisions between objects

I have a number of rolling objects- sometimes when they collide or are in contact, one will slingshot across the arena. How do I fix this? Thanks!

Simpler than "how do I fix

Simpler than "how do I fix it", does anyone know what the problem is? I hypothesize that if the boundaries of two objects come to overlap due to a larger integration step, the program says "holy crap!" and flings them apart. But altering the integration step hasn't had predictable results, so I'm not exactly sure what's going on...

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