I created them with InkScape, native format svg, and exported as emf. I sent the emf and svg to a company to have them put the images on T-Shirts. At the time, everything was fine, and I believe the T-Shirt people used the SVG files to do the work.
On Windows, I opened a couple of emf files with Affinity Designer and Windows decided that it would associate all emf filetypes with Affinity Designer. I thought, what they heck, why not.
I opened the emf files just now with InkScape and they are upside down in InkScape now too. I opened the svg files and they appear fine.
I changed the file association back to InkScape and although the file icon did not revert to InkScape, when double clicked, InkScape opened the files, and they are still upside down.
Years of experience with IrfanView has taught me that it will successfully open all kinds of image filetypes, possibly recovering damaged files and sometimes identifying files that do not have the correct filetype and then fixing it, automagically.
I suppose there must be some subtle bit that gets set one way or another to indicate for the image which way is up and that through some kind of magic IrfanView can infer the correct orientation regardless of that bit?
I don't know if this is a bug, or maybe the stuff that InkScape produces is wrong?