Weird invisible object bug when using water plugin with landmass

I have used water plugin while i was experimenting with program. I’m new to Unreal Engine 5 and i finnished fitting land with ocean, so i tested first person character and meanwhile i stumbled upon a bug of some sort when i walk around the land, there’s suddenly like a invisible object of some sort where character walks over and randomly falls down.
Because im new user on forum i cannot post attachments so I uploaded the video on streamable so here’s the link:

If someone had similar or same problem before help would be greatly appreciated, thanks.