Since changing its name to the Carabao Cup this season, the tournament has served up a number of bizarre incidents and the fourth round has produced another.
There was some confusion in the first round, before a ball was kicked, when Charlton Athletic were mistakenly drawn twice and then in the second round, the home/away allocations were mixed up. Of course, the decision to stream the third round draw live at 4am also prompted collective bemusement among fans.
This time, the controversy is swirling around two of England's biggest clubs - Arsenal and Manchester City - and whether or not they will retain their place in the competition over the application of the extra substitution rule in force.