Dragging a card to a column updates the column's card count, but it isn't decremented

[dev-guy]

See the second half of this movie.

1. Create a board with two columns and one card
2. Drag the card from one column to the other. Do not release the mouse.
3. Drag the card back to its original column

The number of cards for the second column changes from 0 to 1 in step 2 but it doesn't change back to 0 in step 3. It will however change back to 0 when you release the mouse.