Perhaps if one had 2 users in whole of the last month (or prev 30 days may be) and today your site has 202 users, in just one single day, then his Dau/Mau would be 101%
Thought over it/Calculated as much as my brain permitted.
Also, though the error pointed by you isn’t visible to me on my site, but it seems that I’ve stumbled upon another, as mentioned by me here.