Drag and drop Tiles

[nlexa]

DragNDrop.zip

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I've made this wee program. You can double click on each tile and type some text, hit enter/return to exit typing. You can click and drag the tiles over the other tiles and they will shuffle.
Under normal conditions it works fairly well BUT:

If you grab a tile and start dragging it around really fast like a madman and finally release it strange things start happening.
If you drag and drop a lot of tiles in very rapid succession it also behaves not the way I intended.
Nothing should break the initial setup formation but it does if you go crazy on it.

I really like what I have so far I just need to make it idiot proof. Why/how does it behave like this? It's like it didn't get the message that I've stopped dragging the tile (field) and the fields keep sliding around when I mouse over them.

Any feedback will be appreciated.