going crazy withe text aling

well it is the same setting – but you placed on the other textblocks manual breaks:

see:
(click to enlarge the images)

and because of text-align: center – these phrases are not the full width:

As i mentioned above – and Mike pointed out again – there are a lot of manual set linebreaks (<br>)
but if you like you can force a max width of the p-tags by font length units one of the modern one is ch (The width of the 0 character of the font in use) so – 110ch means nearly 110 characters. A more common font unit is em (The font size of the element, or its nearest parent container)

I would not recommend this procedure; I would probably rather limit the container itself there, but so that you can see that it also works via css:

#top .avia_textblock p {
  max-width: 110ch;
  word-wrap: break-word;
  margin: 0.85em auto 0;
}

this (huge padding left/right) is not the best method to restrict the content width; because what would you do on mobile?
There are settings on the column element itself to rule those settings for smaller screens. But – none of them is seen in the DOM – inspecting that page with dev tools.

now here is a pre question to be clear. After setting up your background-color on color-section – and the padding on 1/1 column :
Did you always complete the corresponding entries at the bottom of the element with “save” before you saved the page?

#top.page-id-918 #av_section_7 {
  background-color: #7bb0e7;
}

#top.page-id-918 #av_section_7 .flex_column.av_one_full {
  padding: 0 150px;
}

And btw. on all your other color-sections and 1/1 columns you do not have there a padding of 0 150px
The width is determined by manually set line-breaks !

that is the reason why i asked if you have clicked the “salvare” button after inserting your settings. And then save the page.

PS it is now ( but check the above said please )

#top.page-id-918 #av_section_6 {
  background-color: #7bb0e7;
}

#top.page-id-918 #av_section_6 .flex_column.av_one_full {
  padding: 0 150px;
}

and ( hm?)

#top.page-id-918 #av_section_6.main_color {
  color: #eeee22;
}