Preview 'Actual Size' isn't working properly

Hi
This is a long-standing minor irritation, but I would love to resolve it if possible. Preview opens an image and fits it to the screen size which is fine. If I then click Actual Size, it gives an image which is twice the actual size! I then have to do a single Zoom Out to get the real 'actual size' (which is still bigger than the fit-to-screen size).
This happens very often, but not every time (some images seem to work ok). Most images I work with are jpegs.
Anyone else notice this? Is there a solution?

What you report is normal.
An image at 150 dpi will display at half the size as one at 72 dpi or
72 dpi will display at twice the size of one that is 150 dpi (actually 144 is twice 72 but close enough)
_It is inverse._
I have already said this.
If one was to increase the ppi the 'actual size' would become smaller.
and the opposite also applies. They have an inverse relationship.
You are making the mistake of thinking that Preview is an image viewer.
I am NOT talking about the 'preview' that can be chosen when printing a document, I am talking about the APPLICATION Preview, the one with the dock icon that looks like a couple of photos with a jewellers loupe sitting on them, and with a menu bar that has Drawer, Rotate, Zoom
The Print Preview and the one in the Dock is one and the same. It is not an image viewer, that is just a feature. Preview is primarily a Printer Preview Utility. I have already said that. It can show documents and it can also show images.
Because it can show images you think it should be like an image viewer like Photoshop. It is a Print Preview application designed to show how an image will appear before it is sent to print.
The lower the DPI - the larger the actual size will be across your monitor's screen.
It works in DPI resolution to talk to the printer.
Photoshop works in absolute pixels X pixels to talk to the screen. They are doing two different things and you fail to see that. There is nothing wrong with your Preview application. Apple's Preview is the same thing as Photoshop's Print Preview.
Rather than lock on doggedly to your misconception, put it aside for a moment and take a fresh look.
I've done repeating myself.

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