I should also mention this is not on my sig rig, but a work PC. A Dell/Windows 8.1 machine. Less than one year old.
Checked for updates, said it is up to date.
Check the font folder, Arial is in there, opened the font file, also checked Helvetica.
THIS is the website that I first noticed it on, and the one screenshotted above. Does not happen on OCN.
Does happen in Brave browser.