Drag and Drop

One way it could be done:

Remove all your current triggers
Set your drag and drop like this:

On the drop targets, remove the states - the drop hover was only working on the correct drop target in this set up, so we just want to clean it up.

Instead, add states to your text boxes:

The "drop correct" state for the text box is blank. So when it is dropped incorrectly, it will snap back to the original location. When dropped correctly, it will shift to the invisible "drop correct" state.