(I know it is not the same breakdown, but the reason is the same)
second, your segment for "exclude" countries does not do what you expect. If you have a visitor segment and add condition "does not contain /es" you might get visitors from /es as well. why? because the segment is looking for all visitors who had at least ONE hit not containing /es. that means if somebody first was on /de, later on /es, he will match the segment (since the /de was the matching hit).
if you want to exclude visitors who have seen an /es page, you need to change the segment: use "visitors" and include "/es" the "exclude the whole container (use gear icon on the container on the top right)
I've changed the date at the top right to see only Jan-Nov 2018. The same 4K difference.
Then I added the segment at the top and Unique Visitors as requested and this is what I got:
Even though the right column with the Europe segment says 383,807, the sum of all the results underneath is 387,847. Which is only about 100 difference from the sum of the left column:
I'm not sure what to make of that!
Also, whilst checking every segment separately I've noticed that the filtering is only working to some extent, meaning, I'm excluding some subfolders, like this:
But then when I analyse the segment's URLs, I still see some visitors on the subfolders I'm trying to include:
Because these are a minimal portion of the actual visitors in that country segment, my only theory is that these are users that visited both sites, however, if I'm creating a "Visitor" segment that excludes "Visitors" that navigated through those sections above, I would expect not to see these at all??
That's something interesting and it actually fixed another discrepancy I had in another chart. However, even after doing this, I'm having the same 4K difference between the group of country segments and the segment made up of those...Same exact 4K difference.
in your first table (with the bunch of segments) did you change the "total setting"? hoover over "segments" and open gear icon, change settings to "total based on all rows" (not the default sum). this will de-dublicate the visitors based on the segments.
I expect that the numbers will match after changing, the difference are those unique visitors who visited the page for different countries...