Default app reset

i have quite the weird problem.
i can usually set my preferred application in said application.
however i now noticed that when i set my browser to anything other than vivaldi snapshot it instantly resets to it, i never noticed this happening before so i have no idea what could possibly cause this.

well than, i wrecked my brain about this for minutes, trying to find whatever obscure solution i need but than…well, i forced the option in the settings of the other browser and now it works.

so i forgot the easy option, tho id still like to see if anybody is knowledgeable enough to see what could have caused this.