How can i stop this from happening?

[fierce topaz]

The render distance is very very small on these rocks and i makes my map look untidy.
(It only happens on these rocks)

[knotty summit]

Use this mod and adjust the distance settings for different items until the rocks stay visible to your liking. Be warned, increasing visibility distance has a major impact on FPS.
https://steamcommunity.com/sharedfiles/filedetails/?id=1680642819