Exceeded maximum raid count

So I haven't switched guilds lately (I did last month for DS TB, but not this month, and that was the first guild switch in over a year), but I was denied rewards for CPit today because I had exceeded the raid count.

Does anyone know if this is possible without switching guilds? I mean, if I unknowingly violated the raid limit, then fine, I unknowingly violated the raid limit, but that seems unlikely now. I mean, if changing guilds within the alliance last month (my guild wanted to go back to Hoth to get the max stars feat & I already had it, so I let someone else swap so they could get it) led to too many raids, wouldn't that have triggered something last month, not this one?

Does anyone know how this works? I don't want to file a frivolous bug report based on misunderstanding how the raid limit works, but ... this seems weird.