I explained this in discord. This is what happened:

It's actually not a bug. So a couple of the communities that exist, like the $MAVAX one were created earlier than the rest and had some token configurations that are a little different. The token prices currently operate with a stepping function, but these older communities have more "aggressive" stepping in that the price adjusts much more at each level.

So what you're seeing is that someone sold and the token price adjusted back down to the earlier level, hence the much lower market cap.

Only a small amount was sold off, but it set the token back to the previous price step, hence why it seems like such a huge sell-off. In reality, only a few dollars was sold to take it to that level. If there is a purchase, it will likely take $MAVAX back to its old market cap.