Two titlebar buttons shown which do not align

[KronosBlaster24]

Hey guys! I’m new to manjaro-kde and have been trying my hand at customization. I installed kvantum-manjaro and messed around a bit. Now two sets of title-bar buttons are shown (one behind another) for certain applications like firefox and pacman manager. It does not occur when Firefox title bar is enabled but only when it is not. Unable to embed screenshot for some reason. Please help.

[KronosBlaster24]

In case anyone else is facing this issue its something to do with GTK themes. Its also the same thing that causes some applications to have another theme from the global one.
Settings>Appearance>Applicatiion Style> Configure GTK themes to change the GTK theme to the suitable one

[bogdancovaciu]

Was already discussed here

GTK themes doesn't work correctly after Plasma 5.20 upgrade (Manjaro testing)

It can be noticed in case of pamac. If the new GTK theme is applied, all looks fine: [Screenshot_20201015_184036] But after the session is relogged or system restarted, the window buttons are missing: [Screenshot_20201015_183729] They are there and I can close the window, clicking the empty space blindly, but the issue persists with every GTK theme I tried so far. I first suspected that my themes were outdated, so I downloaded some recent ones but the issue stays.

and here

How to restore default style of windows buttons in Gnome-Shell

That means it created inside ~/.config/gtk-3.0/ the following: assets/ - folder for the buttons to integrate with the Breeze theme colors.css - to match the colors of the color-scheme used in KDE Plasma window_decorations.css - to decorate the windows according to Breeze This 3 need to be removed and keep just gtk.css settings.ini Log out and back in once you remove the 3 above and all will be back to normal.