Ugly font in gnome and gtk softwares

Hi, I think gnome and gtk softwares have problems with Arabic and Persian fonts.
I added some Persian fonts to various distributions that had GNOME desktop or GNOME-based desktops.
(By creating a .fonts directory at home).
Although I can use fonts in software (like libreoffice)
But I don’t know why my system font is ugly!
I changed the font of the system with gnome tweaks software
But no change, and the fonts are ugly.
Now I’ve reinstalled my distribution, and of course I haven’t added any fonts
But today after installing 0ad game, the telegram and Firefox fonts were ugly!
And sometimes other software fonts get ugly too, what’s the problem?
[sorry for BAD english]

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