Mixed Mode Skeletons broken?

No matter witch wave, no matter solo or with friends. 5 times in a row on 5 different maps a skeleton get stuck in the spawn chamber. this happened on wave 25, 3, 12, 20, 18 on Glitterhelm, Endless Spires, Summit, Garden,  Labor. The skelteon dont despawn after 40 minutes. Give it a fix for that problem or is mixed mode generall broken?

I've only had this happen to me once on wave 24 of promenade NMHC. Otherwise, it's never been an issue but I haven't run glitterhelm yet. They eventually came out of the spawn door when it happened to me. 

same problem again exatly now, wave 5 on endless spiress. when you open the map the spawn chamber in the right upper corner there is the skeleton stuck.