Amending an amended return

HI there, I need to amend an amended return on turbotax (related to a 1099-R).  I've seen in previous posts that you can do this by deleting the existing 1040-X from the first amendment.  However, when I do this and then do amendment, the refund amount does not reset to zero (it instead shows the total refund after the first amendment).  For context, I mailed the return in, didn't file it electronically.  Any help would be appreciated, and if the question isn't clear I can hopefully clarify further.