I recreated your button as closely as possible with a UIStroke and a UICorner, and it looks pretty red to me. If it’s only orange in studio but not when you screenshot it, it’s probably because the lighting surrounding it is so bright it makes it look orange.
It may not be your Studio. If it looks orange in Studio but not in the image you sent, then try re-installing it? If it looks orange-like everywhere, it may be your video card.
This is not an issue anybody can help you with, if it “appears” red only in the screenshot that means it is related to your PC. It could possible be because the night light is on, or there is something wrong with your monitor’s colour settings.