Hi Karl,
I did some additonal tests.
Here are my findings. I hope that it makes some sense, it's difficult to describe it clearly.
It's a bit mind boggling...
But shoot your questions if you do not understand something.
EDIT: I found that on a different computer the findings are not exactly the same. Especially Finding 2) below I could not reproduce on a laptop with smaller screen.
In the tests described below, clicking on 'Home' is a kind of reset... it gives the same results as if I opened a new browser window.
Finding 1) After I click 'Home' MOST galleries that I open in the menu-carousel are irregular.
And the irregularity concerns always the same images in the gallery being shown (=always the same images are glued together).
So: after 'Home' MOST menu-carousel-click gives a irregular image-pattern.
Clicking after this on some other menu-carousel-item gives a regular pattern. Even if that menu-carousel-item would give an irregular pattern when first clicked on.
In short notation:
Home
click on menu-carousel item
=> irregular (for most galleries)
clicking on another menu-carousel item
=> regular
clicking on another menu-carousel item
=> regular (see exception of this in Finding 2)
Finding 2) This one is strange:
After I click 'Home' SOME galleries that I open in the menu-carousel are regular.
For example clicking in the menu-carousel on 'emptiness / 13th series' gives a regular pattern (at least on my large screen: there are only three images in it).
But when I click after that on 'winter' in the menu-carousel I still get an irregular pattern.
After that: every click on another menu-carousel-item gives a regular pattern.
BUT!!!: as soon as I click on a 'emptiness / 13th series' again (that is the one that shows regular patterns when clicked on the menu-carousel) a gallery like 'winter'
is irregular again when clicked on the menu-carousel.
In short notation:
Home
click on menu-carousel item (i.e. 'emptiness / 13th series')
=> regular
clicking on another menu-carousel item (i.e. 'winter')
=> irregular
clicking on another menu-carousel item
=> regular
Fiding 3) After I click 'Home' and subsequently I click on one of the menu-items, the folder with galleries belonging to that menu-item opens (=normal behavior).
But regardless of which gallery I afterwards click in the menu-carousel, this gallery will always be regular.
It doesn't matter if I click i.e. 'places' in the menu (which shows the folder with the places galleries) and after that I click on 'winter' (which is a submenu-item under 'more') in the menu-carousel.
Every one of these kind of combinations give a regular pattern in the gallery being shown.
So: after a folder is being shown, every click in the menu-carousel gives a regular pattern.
Finding 4) When I've got the situation that I'm looking at a gallery with an irregular image pattern, I get a regular pattern by refreshing the page (F5).
EDIT 2)
I get the feeling that a page that is showing a gallery inherits some values from an earlier shown gallery.
Maybe some variables that are not initialized between the showing of galleries?
And when a folder with galleries is shown, there is a correct initializing?
As I noted before: some questions from someone who is lacking the technical insight