Sometimes when I'm grinding the Behind The False Mask dungeons on auto, there will be the pop-up at the end of the battle saying I've used all my Troopers. However, I had only gotten about 10 battles in, and I was using my Troopers' Eddies.

It has indeed used the correct amount of Troopers (10), so why does it keep saying that I've used them all after 10 runs? I can still use my unused Troopers today, but it's a bit disruptive. I haven't run out of Sands of Time either.

Anyone else encountered this? It's happened at least 3 times to me so far.
Thank you!