Dynamic Lighting Bug in Tomb of Annihilation - Fane of the Night Serpent

Hello, in my current game I'm running I am using Tomb of Annihilation from the marketplace and my characters are about to enter the Fane of the Night Serpent. I was doing some prep today and noticed an issue with the dynamic lighting on this map that I can't figure out how to resolve. Any help would be greatly appreciated! When I go to the Updated Dynamic Lighting tab for the page and set the GM darkness opacity to 100% only a large chunk in the centre is illuminated and I can't figure out why.   I've tested CTRL+L using a character token...notice the weird visibility inside the walls and in a couple rooms/passageways: Any ideas what is causing this funky behavior? Would love to have this working correctly for my next session! Thanks so much

For the time being I've reverted it to Legacy Dynamic Lighting and that seems to be working fine. Would be awesome though to have UDL working too!

There was a weird thing once that happened for me, on Lost Mines of Phandelver, where the map token itself had a set Vision and lightsource on it. Check if that is causing it? 

@Anung - that was totally it, thank you so much!