is this a glitch? what is going on??
Yes, it's a glitch. There appears to be an error in the circulating supply which led to the inflated market cap of $432,949 Trillion currently.
To confirm it really is a glitch, check the rankings on other coin trackers, or check the top icons on CMC, the total cryptocurrency market cap is still at ~ $1 trillion, and Bitcoin still has a market dominance of above 60%, these contradicts the figures being shown for WBTC.
Edit: The glitch has been fixed and WBTC is back to 13th on the ranking -
https://coinmarketcap.com/