Just curious... how is it possible for a wallet to have a negative -77,000 coin balance? Or am I just not interpreting this correctly?

http://dankexplorer.com/address/REatsvKLjSVTY9khpvWoz5Ws5LxQBsbot8

Strato

(Before jumping to conclusions - I may just not be looking at this right - but it looks like a negative balance wallet??)