Hello, the rules work as intended and this is just an issue with the UI representation.
The match squad rules states that; "If the minimum number of players in the match squad cannot be met, spaces must be left on the substitutes bench".
However, this rule refers to the match squad, not the playing 11, so only applies to the following rule:
"Minimum of 10 players trained in Romania for 3 years before 21st birthday".
We will review how this information is represented in the future, thank you for raising.