What causes inline pictures to show up differently from time to time?

1st picture from the left
So when people attach pictures inline it often displays some pictures differently despite all pictures being of same size.
See the attached picture and one can see the smaller pictures has a width="600" addition in its HTML code while the upper larger pictures doesn't.

2nd picture
Reloading the web page and they are all expanded fully (which is wrong behavior, as all pictures should be downsized to 600px width before clicking on picture and panning in).

3rd picture
Expanding the browser window to cover the whole computer screen, in my case 1920px wide and reloading, all the pictures are now downsized as should be down to 600px width, but I never use browser in fully expanded mode so I don't see it as a solution.

Just one example found in the following post out of thousands and has been so for a few years.
Low distortion current driven Class-B output stage

Then there's the other variant where a small thumbnail like picture is attached inline, clicking on those send the browser to a new page and so the current post on DiyA one is currently reading vanishes, it's quite frustrating when interpreting a complex schematics while concurrently reading the post describing the circuit, I hope pictures without panning and dragging function will be completely abolished in the future.

But I guess it's all a "won't get fixed" case until the new forum SW upgrade, although it was promised at least some 2 years ago it would come "soon", I don't blame anyone for the slow transition, but maybe the maintainers of the forum are instilling themselves into a state where they stop fixing even some simple bugs because the new forum SW is always "just right around the corner"..., ok rant off for now. 🙂
 

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