Weird font rendering in some apps

Hello everyone! I started to use GNU/Linux a week ago or so and I don’t have lot of experience yet, only I know some basics.
I have a problem with font rendering in certain apps. I figure that is an scaling problem but I’m not entirely sure. To give some information, I have 2 monitors, both with same resolution and scale set at 100%, only different refresh rate. Also Anti-aliasing is enabled, sub-pixel rendering set to “RGB” and hinting “Slight”.
(More info if needed: Nvidia Driver Version: 580.95.05 - Fedora 43 KDE - Kernel 6.17.7-300.fc43.x86_64)

So, the fonts of system apps looks good, the problem comes with Firefox, LibreOffice or Discord (to mention some of them), when the Anti-Aliasing doesn’t applies at all in certain scales.

100% Scale. Calibri 12pt
This is an example text in LibreOffice (Pre installed app).
Now look the next screenshot.


Here looks better than the other image, so I think the Anti-aliasing is working as intended (90% scale)

100% Scale. Arial 12pt
Other thing it gives me a headache, is that this is doesn’t happening with all the fonts, they are some of them. Arial or Times New Roman renders well in this image, but not in Calibri. In Youtube I have same problems with their fonts (Flatpak Firefox), but not here in the forum.
Maybe I imported the fonts bad in the system? I’m dual-booting, so I copied the fonts folder in Windows and pasted it in /home/User/.local/share/fonts/

Setting Hinting at “None”, seems to work. Fonts looks a little blurry but are well rendered. But I’m not having the same luck with Flatpak apps.

Anyone having the same issue? Thanks a lot for reading my first post!

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