Hello DrThril, welcome to the forums.
Do you happen to have "MS UI Gothic" installed on your computer?
Why I ask this is because some of the fonts you posted looks like Japanese-style design, "管理器" for example.
And if that is the case I have a possible scenario causing this, as I had similar issue about Japanese fonts before.
BTW current Avast UI uses "Meiryo" for Japanese, not "Meiryo UI". And before "Meiryo" it used "MS UI Gothic" for some time, which rings the bell for me.