I’m assuming that’s a scrolling frame. It’s already known that dragging within scrolling frames can get a bit buggy.
Try using the properties panel. It’s much better practise to get used to the properties panel as it’s faster, flexible, and more accurate.
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I’ve had this type of problem with a scrollingframe. One fast way to move around this is to go into its properties and temporarily disable ScrollingEnabled. This is so it doesn’t glitch out while you’re moving elements.