I am curious also as to what causes that.
I see you were on this thread where I ran into that also. But I didn’t have FIFO to deal with. Eek.
It happened to me again this year. I just didn’t have any motivation to see why.
For me I assumed it’s because I hijacked the process (see steps 8-10). Maybe it’s that stupid part in our system that has a lowercase A in some places and an uppercase in others.