The devil's in the details:
Clips from your video show what happens:


After changing the return above the tool switched from Return to Straight Cut:

The tool remained in this state (Straight Cut) when you attempted to edit the last return:

The tool's options are trying to be helpful, they see that both ends of the first sweep have already been changed to returns (after you changed the second one) so it switches itself over to the only remaining option for that sweep (Straight Cut).
It then remembers that option when you start it again on the second sweep.
You just need to tick it back to "Return".
-G
Gary J. Orr
GaryOrrMBI (MBI Companies 2014-Current)
aka (past user names):
Gary_J_Orr (GOMO Stuff 2008-2014);
OrrG (Forum Studio 2005-2008);
Gary J. Orr (LHB Inc 2002-2005);
Orr, Gary J. (Gossen Livingston 1997-2002)