Photos have horizontal line artefacts when shared to iCloud shared albums
When I try to share photos from my iPhone or iPad (they're all synced with iCloud Photo Library) to an iCloud Shared Album, some photos are corrupted with weird horizontal lines. The originals don't show these lines. I've tested on both iPhone and iPad, I've also tried re-editing all the photos and sharing them again. This only affects some photos but not others, and weirdly it only affects a portion of the photo.
An example is attached.
Can anyone help?
iPhone 6, iOS 9.3.2