Yet another European Panthers fan here. I'm from Finland and I've been a fan since the Panthers played in the Super Bowl (which was the first American football game I've watched). I've even been to four Panthers games (2010 against SF, 2011 Bears and 2012 Saints and Giants at home) and watched almost all the Panthers games for the last five or so years (NFL Game Pass is very good btw.)
In ten years I've learned to understand the game quite well but I still not completely sure what causes the illegal formation penalties.. =)
Illegal formation comes down to either too many or too few players lining up at the line of scrimmage, you have to have seven on the line and five off.