+1 having same exact issue with same show. it seems like mine was playing in abc order. a fix I found is going through the episodes in jellyfin and giving them their episode number. none of mine had one before and I used sonarr for reference. Checked using a new user and they were in the right order 
it can be a bit tedious though, would like a better solution.
it can be a bit tedious though, would like a better solution.