Its actually not issue..when you had 5-2-3 tactic. look some last season match protocol(page where is all stats about that game) and look at your players positions - you can see that you have 3 defendes..5 midfielders and 2 strikers.
Example:
http://www.managerzone.com/?p=match&sub=result&tid=346922&mid=846670223
NR 11 Erdiano..is displayed in match stats as midfielder..in old tactics he is displayed as striker..so new has correct position borders