Bug With a Stack of Troops

So i woke up this morning and logged on, i saw that one of my stack of troops were ready to be moved into my capital, but when i click on it, i couldn't move it. The stack of troops was permanently stuck there, the game also said that the strength of the stack was 0, and when i tried to split it, it would show up as a blank. All my other troops were working perfectly. What was even worse was that once i clicked on the stack, it wouldn't let me unclick the troops. Resulting in me having to restart the game every time i click on the stack/