Image rotation

Hi

I have some rotation issues with images from my Windows Phone taken in portrait mode that confuses me. The pictures look allright on my Windows 10 pc in most of the image viewer programs including Windows’ own, Paint, Picasa etc. Only in Microsoft Office 10 Picture Manager is it flipped to horizontal.

When I upload them to Media in WordPress (in both Chrome and MS Edge) they are flipped to horizontal. So I rotate the original to the right in WordPress, and now the pictures look fine in all sizes when inserted on pages and posts. However when clicking on the picture in the post linking to the original full size picture that picture is now flipped one time too many to the right. That is also how it works in Firefox but in Edge everything looks fine.

When I check the pages on an iPad with Safari and Chrome even the cropped and rotated images in the posts are in horizontal.

I have tried rotating the original on my PC with Microsoft Office 10 Picture Manager, but that just creates a new version of the rotation issue.

You can see some examples here:

https://bueogpil.dk/ (second image on the page)
https://bueogpil.dk/oplevelser/med-taks-til-odinstaevne-2016

Any advice would be highly appreciated.

Thanks,
Jon