Need Help With ComboBox Widget!

Hello. I have created a selection box that allows user to select desired resolution settings. Problem I have is when I go test it in game, i get this as seen below. The box appears in a completely wrong place and it’s driving me insane. I want it to appear under the blue box like you would normally expect. I just can’t seem to find the cause for it let alone fix it. Any advice on the matter is appreciated. Thank you.;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==