Is my drag and drop causing my character to phase through the floor?

Okay, I’ve been experimenting with Drag and Drop (I’ve been following the old live training videos on this topic), things had been going fine until I overrode the “On Drop” and “On Drag Detected” functions for my inventory slots (I’m also willing to concede the possibility that it could be the “Move Item” or “Move Image” functions in my MyPlayerController messing with thing, but, I doubt that).

Since then, my character runs freely through the air like I’d changed the movement mode to flying (Even though I haven’t) and, on top of that, my character also runs through the floor!

Has anyone seen this before? Do you know how to fix this?

Here are my functions, just for reference: