Enrollment window Still open

Summary:

System is not closing enrollment option although election has been made.

Content (required):

At hiring event which configured at program level, we have two plan in this program, Now if employee select any or both plan and summitted then system shouldn't show enrollment window again.

Path : Program - Enrollment- (Life event) set Close Enrollment Period Date When elections are made

Issue : System is still showing enrollment window through clicking at Make changes then employee again modify information, how can we stop one enrollment has been done employee can't do any, if any thing need to be done then Administrator will take care.