u/S-B-C-V

I was following along with a random YT video on how to do garter stitch. I’m a looming newbie, doing my first project (scarf) . I started the casting-on part, using e-stitch … but when I get to the last e and then start the reverse to finish the foundation row, that last peg ends up with just a twisted loop around it that isn’t knotted or held in any way. I replayed this video several times, following along.

What am I doing wrong? Is it really supposed to just be a twisty loop with no apparent knit/knot/locking around that last peg? Does this make sense? Should I give up on e-stitch foundation and do something else for flat projects like a scarf? Help!