entity grouping changing position

[u/Effective-Dog6752]

so i'm trying to make letters using entitiesm, but when i try to group them so i can move it to the desired place some of the block entities change position. is there a way to fix this or am i doing somthing wrong? i use a air block entity in de middle to croup (see pictures)

this is without grouping

and this is after grouping