TG error

I created a TG about two months back and it has few BP.When i try to open the same TG it doesnt show any BP now though on staging area it show the count.Other TG created at same time able to show BP when open TG.

i believe that previously created TG doesnot get updated, as i try to create TG with same filters it gives me different size of TG.

what possible error can be for target group doesnot show any Business Partner when try to open it, any comments ?

thanks