Summoner at 90 without leveling!

[Absimiliard]

I just noticed that my Summoner is at 90. I haven't played Summoner in at least three years, since well before 90 was the level cap. I returned a couple of months ago, it was at 66 (where I left it). I've been getting all my jobs up to 90, but have only managed DRG, all four tanks and two of the healers.

There is no way SMN should be at 90, I haven't even equipped the gear.

Can anyone explain why it might be at 90 without being played? Could my account be compromised, even with a one-time password?

It's the shared base class. Arcanist becomes and therefore levels both SMN and SCH. Can't raise SCH without SMN also going up and vice versa.