Incorrect display in editor/browser

I keep running into the same problem when creating/editing blocks: how can it be that the spacing of the blocks in the Nicepage editor is different than when I then open the web page in the browser? I have attached an example (one of your presets) where you can see the problem (I have marked the area with a red arrow).
As you can see, the spacing of block 1 at the end is different (larger) in the editor than in the browser.... I have had this problem more often now and it is somehow very annoying, because with it in the browser an area of the block is no longer visible, which you have designed in the editor before. Is there a solution/explanation for this? Thanks in advance