You are most likely experiencing a glitch that occurs nearby “overmap” borders. To see over-map borders and confirm this make a brand new world and after starting the game go into debug menu to select option 4. Reveal Map. You can then use debug menu option 3. to teleport nearby. Walk along or around the bother and verify if those are the same glitches you’ve been experiencing, then walk away and verify if the glitches stop when you are further away.