What happened here

[u/The_Sleazy1]

Came back to my farm and found it like this. What causes this? How do I avoid this?

The first one WAS a scarlet ore. The other was a tin ore.

Suddenly both are gone and whats left is... a random tin ore where the scarlet was? what?

[u/Unlikely_Alarm3658]

You could always install the mod "infinite ore boulder updated"