0 Spectators in Cup matches

[Jeorge Collins]

Hi, I've been playing for a couple weeks now and I've a little problem with spectators during my Cup games.

It keeps showing 0 out of 0 spectators, even if my actual capacity is 1000 (capped to 800 because i'm lvl 1 but still more than the 0 showed).
The stadium in friendly matches is always full (800/800), all ticket prices are set to the minimum, all the structures are lvl 2 or higher.
I've no idea why it keeps showing 0/0 spectators..