Robert today I tried to login to thefret and my password was not valid anymore...

I thought that maybe I did something wrong, so I asked for a password reset.
So I reset my password in order to be able to login to my profile and change it back to my classic "all-time-favorite" password.

But I got this annoying message:
"Sorry, you may not use a password that you have used in the past 1500 days."

Is this a security setting of this board or it's a mistake of mine?