Basic manners like a “please” or a “thank you” will go a long way on these forums. Remember that most people on these forums are volunteers. Additionally a lot of people are away on holiday. Also there wasn’t any link or sample images for us to take a look at.
A quick Google search reveals that images can become wrongly rotated in some web browsers if they were originally photographed or edited on a handheld device (tablet or smartphone). They may have incorrect EXIF orientation data assigned to them.
A search on these forums for ‘orientation’ also returns several previous discussions. People saying that images they have added to pages in RapidWeaver have changed rotation.
It could be that your old setup ignored this EXIF data, but your newer setup has started applying it. Opening the wrongly rotated images in your preferred image editor and either editing the EXIF data or going through the ‘save for web’ dialog window should fix the problem. I believe that some image optimisation tools are also capable of removing surplus EXIF data from your image files.