Knobbly tree graphical glitch

Sometimes when I load my world, my planted knobbly trees look... odd.

The one on the left is fine, and the one on the right should look just like it, but, as you can see, it doesn't. Sometimes going into caves fixes it, but sometimes it doesn't. Sometimes reloading the world fixes it, sometimes it doesn't. I honestly don't know what phase the glitchy tree is in, but I think it was supposed to be goopy like the on one the left. Maybe the boat placement has something to do with it.