it makes ghost blocks sometimes when im building

1.16.5

36.2.4 modloader

mod version
1.16.5-2.2

modpack enigmatica6 -5.17

You mean the steep roof tiles from Macaw's Roofs? Since these are 2 blocks tall, construction wands cannot handle them.
The mod tries to place a block in every space it can, which results in roof tiles placed into eachother.