It's been like that since a few patches actually but I forgot to report it. I don't know if that info is helpful but I think the bug was first introduced with the game build that mentioned another UI rework in the patchnotes.
Yeah that is happening because big number is so big it can't fit in the frame. The browser is trying to avoid doing a line break until it absolutely has to. I'll make some tweaks to big number for next patch, but short of forcing scientific notation there's not much I can do.