When I go to click on something in the explorer to access it, Studio will register it as me holding down on it so when I move my mouse it also moves the item I had selected before. Here is a GIF of this:
https://i.gyazo.com/04c0bad79b0f30be8ad807daef35cdc0.mp4
Can’t replicate in a baseplate but happens in this place when using Studio. I am running macOS 10.13.3 on the most recent Roblox Studio.