Pro Sites settings reset and renewal not actually working

For some reason, on my test site, the payment went through, but the site didn't actually renew. In fact, the account lapsed and went to free.

I noticed this morning that for no explicable reason, my Pro Sites settings had all reset. This is scary for me, because it would completely break the functioning of the site. I don't understand why the settings themselves would ever be volatile. All I did was install the multi-domains plugin, and it seems to have nuked pro sites completely.