mx-dialogue goes nuts

Hi I have this problem that comes up from time to time where I do something in CSS/MBM that causes the dialogue boxes (modal-dialog mx-dialog mx-dialog-info) to go nuts. I have no idea how to diagnose this problem. Here is a screenshot showing what happens when I click to make a dialogue box appear. The entire screen scrolls down as much as it can and the dialogue is placed almost out of the screen to the lower right. Thankyou in advance
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