corrupted world

We are two People on a realm ( Bedrock Version) .
Blocks or Chunks are constantly clipping and in completely wrong places.
We have to keep downloading and replacing an older backup to get the world back to normal.
But we lose every important progress by doing so.
It's been like this for 3 weeks and we can't find a long term solution for this problem.
Could you please help us and solve this problem?