Portrait mode in Photos app bug

I am on High Sierra, 10.13.1, iMac (Retina 5K, 27-inch, Late 2015), 4 GHz Intel Core i7, 16GB 1867 MHz DDR3.

I have discovered that all my portrait mode shots taken on my iPhone X that came to the Photos app through Photostream came in with portrait mode disabled. When I went to edit them, I turned on the Portrait mode, and the effect mask was misaligned. As you can see in these other two modes, studio light and stage light, it seems that the effect mask is rotated 90º counterclockwise and stretched to fit the proportion. It does this to every Portrait mode photo I have taken. Is it just me, or does anyone share this unfortunate problem?