When I set up the payout table like that myself it tells me the max bet is around 9k bits, so I don't understand why this bet was allowed to go ahead.

That's definitely a huge underestimate. The max bet should be considerably larger.
Although, I'm quite surprised it would allow 0.4 BTC bet -- that seems a bit much to me. By any chance, did the owners of MoneyPot.com change the bankroll risk to a 10x kelly?
If anyone wants a worked example of figuring out the max bet for a normal kelly the maths is this:
http://math.stackexchange.com/questions/662104/kelly-criterion-with-more-than-two-outcomesIf no one else does it, i'll go through it for that bet and see what it should be
To answer this, none of the site's code has been touched since the takeover still. No alterations have been made anywhere in the site, nor has it been rebooted or anything. Current dev. is supposed to be getting this done asap (including things like the support emails), afaik.