With some printers (depending on the driver) you can select to "print mirror image." This is usually hidden in Printer - Advanced Options, or some such place, so you'd be unlikely to have changed it by accident.

The setting is most commonly available for PostScript printers, but may be present in some other kinds.

Other drivers may make it more "visible" so that it's more likely to get changed accidentally.

It's handy for printing iron-on transfers for your T-shirts, but I've not found many other intentional uses for it.

In Word, the "flip" function is on the "Drawing" toolbar as one of the rotation options. If you *select a picture by clicking on it, then Click "Draw" on the drawing toolbar, you can rotate or flip the picture. If you added annotations to the picture, you may have had the Drawing toolbar up and could maybe have accidentally done a flip?

*If the document has been saved, you may have to select a picture, Copy it, Paste it back, to enable rotations in the Drawing toolbar. The option sometimes isn't available if the picture has been "flattened" into the document.

John