blocks reverting back to what was deleted and blocks disappearing when placed

hello, my game had an update this morning, so i updated it. once the update was done and i logged into my world that ive been working on.

 

Issue #1 - i deleted some planks so i could replace them with stairs and when i placed the stair, the stair disappeared and the planks came back in its place. this happens no matter the block style. 

 

Issue #2 - when i place blocks of any style they instantly disappear

 

Issue #3 - if i delete grass blocks from the world, in time they start to come back and fill back in the area that i clear out. this also happens when i delete block of any style. if i delete one and step back and wait it will eventually reappear.

 

please help, i would like to get back to my world build.