image size bug

i dont know if its just me but i finished my second theme and decided to mess around with the card image size slider.. it literally reverted every card image back to the originals. then, i messed with more sliders and the sidebar changed, the background did, literally everything reverted and i lost all my progress on the new theme. after trying to fix it, editing themes became laggy and wouldnt show me what i was trying to change!! ☹️