I have seen this in Pro 2.2.2 and 2.2.4 on Windows 7. Create a project with a legend and/or a text element and/or feature labels and share as a pdf. The legend and/or text element and/or labels are flipped upside down and shifted to the top left corner of the pdf. I've seen this on two different computers and with several different projects. Some projects are fairly complex with 2 or more map frames, dozens of layers, multiple elements, lots of label properties, and a large format layout. But once it was a very simple project with one map frame, just 3 or 4 layers, a legend, one text element, and a 8.5 x 11 layout.
I also tried arcpy layout.exportToPDF with a variety of parameters with no luck.
I've gotten it to export correctly by removing the legend or the text elements or a layer or two. I've also gotten it to to work by exporting a jpg instead of pdf. But I need the pdf with all my stuff.
Has anyone else had a similar problem? Thanks.