Hey GirSaysDoom13,
We see that you're experiencing an issue with the Verdana font in some apps such as Mail, Safari, and Keynotes. We will do our best to assist. Since safe mode can help determine whether issues are caused by software that loads up as your Mac starts up, we suggest booting into it to see if the issue happens there. For steps booting into safe mode, click here: How to use safe mode on your Mac.
Once in safe mode, check to see if you're experiencing the issue. If not, restart and boot up normally and see if the issue is resolved. If not, restoring the fonts may help. For information about restoring fonts originally installed on the Mac, click here: Restore fonts that came with your Mac.
Take care.