This is being investigated at the moment and the 2 constants noticed so far are the Quartermaster General and the Black Knights adventure, so the thread has been renamed.
Please mention in your comments if you had you were using the QM or if you were doing BK when encountering the issue.
on arriving at my adventure the qm went into star due to lack of landing spots, the troops were unloaded so I assigned them to my mma and sent attack. i left adventure. when I came back qm had mysteriously placed itself and all the troops it had previously unloaded were in there. my mma was dead and the battle report looked like this.
this also happened with a slightly different variation on my northisle character yesterday where I placed the qm out of star and the troops jumped back into qm.