After termination date under plan participation tab the plans are not showing why?

Summary:

Hi Experts,

I terminated one person two months ago but if i go and search his record under plan participation tab the plans are not showing and if i tries to add the enrollment the plans are not enrolling because he was already terminated.

Was this actual behavior what is the reason for this and how can I see his earlier balance.

Content (required):

I terminated one person two months ago but if i go and search his record under plan participation tab the plans are not showing and if i tries to add the enrollment the plans are not enrolling because he was already terminated.