Signatures are automatically enforced in the enforcement readiness period

Hello,

We have created our security policy in automatic learning mode and the enforcement mode is blocking. We have customized the enforcement readiness period for 60 days.
We are noticing that some traffic is being blocked by signatures that are 'enforced' even though we are still not reached the 60 days period. We are re putting the specific signatures in staging mode and after couple of days they are automatically enforced and are blocking traffic. Is this a normal behavior?