Removing Troops From Queue Error

I'm using giants and barbs in this example but it occurs with some other troops as well.

When training troops, if there is a giant(1) at the front of the queue and a barb after that and the rest are giants(2).
If you hold down the remove button on the giants(2) at the back of the queue, sometimes it will also remove 1 giant from the front of the queue.
G,B,G

This happens almost 100% of the time. When there is 1 giant(1) followed by 1 barb followed by 1 giant(2) and 1 barb and the rest giants(3).
If you press and hold the remove button on the giants at the end, it removes all the giants in the queue.
Gx12,B,G,B,G