I know nothing about Garuda specifics but it seems you have forgot to delete the pacnew file after doing the mods to the mirror list, hence still getting a warning that a pacnew is present.
The graphical bugs are probably unrelated to the pacnew issue.
Try https://github.com/manolomartinez/greg if you are interested in a minimalistic cli program.
I know nothing about Garuda specifics but it seems you have forgot to delete the pacnew file after doing the mods to the mirror list, hence still getting a warning that a pacnew is present. The graphical bugs are probably unrelated to the pacnew issue.