Hey Chris,
I uploaded 3 raw files to Dropbox for your review. The distortion is visible at the bottom of the Picture Frame. The distortion always appears in the Horizontal Lines of an image: a few examples are the lines found in Picture Frames, Plantation Shutter Slats, Closet Doors with Slats, Door Moldings, Refrigerator and Range-Oven Vent Grill Lines.
I will also send you the Developed Photo produced by the 3 raw images I already uploaded to Dropbox.
Again, Affinity is an excellent Photo Editing Software platform that produces excellent HDR Merged Photos. Affinity is the only Photo Editing platform I have ever used since I am new to photography. Thank you for helping me with this Distortion issue, I sincerely appreciate it.