Alliance Member Number Less Than Members

Is this just another bug to add to the ever growing list?

It says 17/50 but there are 19 members.


Every once in a while our alliance ranks will be missing numbers and the total will increase as if they are still there. I’m ranked 8th but I was at 9. No 8 listed and we were missing 17, 26 and 30 something so the new total members was 54.