Question

شاید برخی وقت ها این درست باشد اما برخی اوقات دیگر، عکس قضیه صادق است

Answer 1

What you are stated above means:

It might not be true al the time ;)

but a closer translation would be this:

 

It might be true sometimes, but other times might be just the opposite

It might be true sometimes, but there might be times that exactly the opposite applies

Answer 2

Although it might be true sometimes/occasionally/now and then, most of the times the opposite might be the case.