So I'm playing as UK, got to the point of invading Germany, and absolutely ♥♥♥♥♥♥♥♥♥♥♥ them and took all their land. Except like a week after the war ends, suddenly I loose it all back to Germany with no warning - no decision, no event, nothing, just suddenly Germany has all their land again? What's up with this, is this a bug?