So I don't want to post this as a bug since I am pretty sure it's a problem "in my TV".
The issue - something has changed since 0.20.1.1 (the halloween patch) and since then text throughout the client has been "different" for the worse.
Here's a screenshot for example:
(You'll have to open it in full size)
So as you can see the text from the chat, minimap and damage taken panel seems normal. But the countour icons and damage panel seems out of order and hardy readable.
For comparison this is how the icons look when viewed in windows:
https://puu.sh/yb7em/88fa6de44f.png
And when you press Ctrl + Scroll Down (once) they look exactly like in the client:
https://puu.sh/yb7ff/b937ad7a05.png
(P.S. I tried different countour icons, had the same issue)
I haven't touched any game settings or changed PC/Monitor etc.
And since the issue appeared I tried to tweak the interface scale in preferences.xml but nothing helped. Going from x0.9 to x1.33 in steps everything looks worse than x1.
So if anyone has an idea I'd greatly appreciate the help