In the "Recent Matches" section of the profile page.
The + signs for +XP +IP sometimes just look like - signs.
They are plus signs (if you highlight them, they are clearly plus signs), but some
of them just look like - signs.

if you look real close you can see the crossbar of the +, but the coloring is lighter.

screenshot attached, picture is running in 1080p.

shutting down and restrating client doesn't change the fonts at all.
... maybe i've just been staring at the screen too long.