Only signed 4 U21 foreign players this year, why can't I sign any more?

[podunkboy]

Managing Southampton in the Premier, I've only signed 4 U-21 foreign players of the 6 player limit per season. It's June 2032, before the season turns over, and the transfer of a 19-year-old Serbian wonderkid because of the 6-player-per-season limit...but I only signed 6 total players this season, and 2 were 23+. So...why? I realize that if this is a bug, it won't be fixed, but am I missing something?

[potbellypigs]

Did you sign any from the previous season that might have carried over? I know that if you've reached the limit for one season, you can set the transfer date as next transfer window (England) and you can still complete the transfer, with them obviously joining at the start of next season.