but maybe I can help.
Most likely, you got negative BTS points from purchases made in the ATS store. If you had only a few BTS points, a large purchase could drop BTS below
zero. Or you had "use BTS points" selected and used all the points there.
I'm not sure, but I believe any deductions for warns, penalties, and things of that nature come out of ATS points. So that's not likely even if you
have warns, etc.
And no, you don't lose points for inactivity.