chinook from event is getting stuck

helicopter from events does not clear. 

here it is on video. this is about 2 minutes long. you can see chinook come in and drop off what ever it needs to dropt off and then flies off and then stops.

same by me, and when 2nd one fly in to drop NPC wave they are stuck both still when event finished

yeah, they disappeared after server restart

i have disabled monument events for now