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Wow, those are some nasty supports!
Sorry, no idea what's causing that...
Luckily though, it seems to be holding the general shape pretty well...so it might actually complete successfully.
The other thing I'll mention is elephants foot. See if there is a setting in cura to offset it. You've got a pretty strong one at the base it looks like.
There also sorta seems to be on on the top of your lower flange... But idk why that would be. All I can think of is warping. Are you using PLA, what temp, is the bed heated, are your cooling fans working?