[fferen]

On the topic of calculator font bugs, Google's calculator randomly switches between two fonts:

https://pasteboard.co/lmbr4iE6BJej.png

https://pasteboard.co/sU3GA5psIaT0.png

[diggan]

Hard to know if you're referring to Chromebook/Android/Web, but looks like the web one. If that's the calculator from the google.com web-page, that is surely a stylesheet/font that failed to load (sometimes?). Try to look at the browser developer console next time it happens for some request errors.

[qingcharles]

The first one is worse because the 0 looks more like an O. What platform?

[fferen]

Edge on Mac, but IIRC it happens on Windows as well. Just checked in firefox/mac and seems OK.