Why are these annoying marks on the letters?

Dropbox - File Deleted

hopefully the link works as i cant upload pictures directly (need 3 points)

These marks appear on letters A and I above font size 18 and with italic selected.
I have not been through all the fonts but they are present on most.
How do i remove them?
ive been through spell checker and language etc all set to english.

W10 pro
version 5032

Thanks in advance!