Why is my Build Tool flinging me when I jump with it?

I recently converted my classic build tools from HopperBins to Tools. These consist of a Build Tool, Delete Tool, and Configure Tool. The latter 2 work fine, but when you jump while holding the BuildTool you get sent FLYING off the map. The Build Tool has a GUI and a LocalScript in it, and when I removed those, I didn't get flung. However, trying to get this to work with the GUI and LocalScript included has been incredibly frustrating, I've been at it all day today :/

If anyone has any idea why this happens, please let me know.

XD this happens with me all the time until i noticed that the tool has to be small so it wont touch the ground, now if it is a tool that you made to be large then try putting canCollide off .