I noticed that there was an issue with the group spacing in this event. The B/C category seem evenly matched. A is nearly there, but D is completely off.
In the first event I did, there was a massive leading D group, and it got overtaken before the end of the first lap. I then went to check the other race results and in 15 to 20 races that I checked the D race is consistently 2 to 5 minutes off the lead. i.e. they just have no chance of winning with the current setup and I imagine this makes the race really horrible for them. The A race is also slighty off, normally 1 minute. This is data I checked on ZwiftPower, so it excludes out of category racers.
I think this should be monitored for events/races like this and edited when its clear that there is a problem.