Program becomes very glitchy and isnt great to look at when switching colors in tkinter

Question

im new to tkinter and im trying to add a theme switcher to my scientific calculator but its not working. ive made a button that when clicked changes the HEX code of the color variables and then i use .config() on the widgets that have the said color variable in their BG or FG its just when i click the button it just glitches a lot. im unable to post the entire code and idk what all snippets to add so the code would make sense so ive just uploaded the code here. here is the link to my code.

here is what the calculator looks like