Hello,
I have noticed that bug (I think it's a bug) sometimes ago. When you want to place a poster on a table (well on a woodplank inserted on a table), the poster will spawn with a variable padding instead of the wanted placement. previsualisation is good but when placed, It is padded like that :
I found a workaround : remove the table, put the poster on the plank and after that, replace the table, it will be ok :
I try on survival and creative, same behavior. I did this example with table, but it's the same on cupboards. I tryed to put a poster of books in a cupboard and it had an horizontal padding (depends of the orientation of the poster I suppose).