it sounds like the toad has some type of problem. Touching it and rubbing its back is the worst thing you can do because toads have mucus on their skin which protects them from infections and diseases and with you rubbing it some of it comes off and if enough comes off then you get a sick toad. It potentially sounds like a neurological problem.

What are the conditions you are keeping the toads in? What temperatures humidity what are you feeding them and what is the habitat like?

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