My cave is all funny and not like the others

so I was in a water cave and stumbled upon a normal cave but as I went in it, it was all like glitchy not to my character but the cave itself,it went right down to bedrock and the water and lava weren't normal it wasn't in full blocks and it wasn't flowing normally, I couldn't see the lava when it got to the ground so I had a chance of burning to death