[Bug]? Lt Big Dave

Not sure if posting at the right place

Found this amazing mod/game yesterday and started exploring it today. But found a problem/bug with "Lt. 'Big' Dave" in the bar area. Been reproducing the bug five times and took screenshots two times:

https://ibb.co/dGh13Z2
https://ibb.co/bs6MVh7
(Sorry for being a noob not knowing how to attach img links in posts)

Playing on android, Delta Touch: GZdoom .2.5

What version of the game are you playing? What version of GZDoom do you use? You might want to post this at http://boa.realm667.com in the appropriate forum.