If a team horse gives birth, the foal is automatically assigned the affix if its genetic potential is above the teams realise amount, regardless of the owner at the time.
It also cannot be sold. The release was probably set after you bought the mare.

You would need to contact the Team admin and ask them to raise the GP release, although there is no obligation for them to do so.

Mrs D

To clarify and for better understanding, the purchased fillies were within team GP release and you can breed with them.
However they were covered with high team stallions before put in sales and the offspring is therefore three times higher than the allowed team release limit.