When my sister joined my LAN world, she can see "Peony Flower" tops all over my minecraft world, and the bottom of the flowers are missing. We did not place the flowers, and they were never there before. We have been working on the world for over a month, everyday, but for some reason tonight wen she logged in it was like this. She can break the flowers, but when she re-logs they re-appear. She can see them, I can't. When she breaks the flowers, it makes sunflower particles instead of peony, but does not drop anything.

We have tried changing texture pack, deleting her .minecraft folder, and changing from version 1.8.1 to 1.8

None of the above made a difference

A solution to the problem would be beneficial, thanks.