Recent difficulties with custom sort order for collections in LR Mobile on my iPad Air. Sometimes, if I drag an image to the left border to move the image in front of an image that is currently at the left edge of the matrix, the sort order for the whole collection reverses top to bottom. It's as though the Sort by Capture Date reverse order arrow had been applied, but, of course, there is no reverse order arrow for Custom Order. Sometimes repeating the maneuver or tapping at the top border switches the order back. Sometimes, you have to manually drag the entire collection, one image at a time, back into the original order. Also, the sort function erratically fails to move the image into the correct spot. If I release a dragged image when the blue highlight is at the desired spot between two images, the dragged image will be placed one spot to the right instead. With the blue target line to the left border of the target image, LR deposits the moved image after that image instead of in front of it. These issues started with latest update. I think these are bugs that Adobe needs to address.