Had you soaked cards previously?
Next time there's a batch that you're thinking of soaking, pick out the least valuable of the bunch; and then soak that one. It's soaking, not moistening. If it's a card that will soak, like T206 or M116, let the card soak overnight, change water. Then change the water and soak a while longer.
If the card was attached to that backing with flour paste, it would have soaked off cleanly. If it was attached with a more modern polar glue, then it won't. I'm sorry that that back damage occurred; it was either a non-water soluble glue, or it wasn't soaked anywhere near long enough.
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