Lightroom CC for mobile: Erratic custom sort order

Durham1, 

I've tried for about 30 minutes dragging and dropping custom sort orders in multiple albums and haven't been able to repeat what you are seeing. 

Can you get me your current iOS version number, current Lightroom for mobile version number, the number of items in your Album?

I’ve had the same issue, chronicled here: https://feedback.photoshop.com/photos...

I am having the same problem on ipad pro 10.5

Im experiencing the same issue on Ipad Air 2 with Lightroom mobile

Problem has now worsened and occurs every time I use LR Mobile Custom Order>Sort. Here's what happens. When I start sorting, the first attempt always reverses the entire sort order. To correct that, I switch to Sort by Capture Date, use the arrow to reverse order back to the original, and then return to Custom Sort> Edit. The order is then back where it started. However, trying to move the photo works in bizarre fashion. Let's say the collection has 5 photos, A, B, C, D, and E. If I drag E to the black line between B & C and release, you would think the new order would be ABECD. Instead, the final order depends on whether I align the blue active edge of E with the left side of the black BC divider or the right side. If I align it with the left or B side, E winds up before B (order AEBCD). If I align E just to the right of the BC line on the C side, it winds up after C (order ABCED). To get E to finish between B & C, I have to align it to the left side of the line between C & D. That puts it in front of C with the desired ABECD order.  Using original iPad Air (iPad 4?) iOS 12.2 with LR Mobile v. 4.2.1 442F0D. Happens 100% of the time even after restarting LR Mobile after doing a hard restart of the iPad. 100% of the time. Totally reproducible. Adobe needs to fix this.

We are still unable to reproduce this with the instructions provided. I worked it for over an hour following your steps and one of the engineers tried as well. 

No matter which side of the black line, I place the blue line, it ends up ABECD - everytime. Is there any more information you can provide? Can you shoot a video perhaps?

I shot a video that demonstrates the problem on my phone to the noreply email address from which you sent me a copy of your post. Not sure if the "noreply" address will work, for obvious reasons. If there is some other address or website I should use to send the video to you, let me know. I would prefer to send the video directly to you rather than post it here publicly. I'm not really sure if this blog will accept a video post, in any case.

LR Classic 8.2.1 (1206193) on desktop running Windows 7 64-bit
Order used in the corresponding collection on the desktop is Custom Order which produces the order on the iPad. Usual workflow is to take photos on DSLR camera (not phone or tablet), import raw files into LR Classic on desktop, create a collection on desktop, arrange sort order on desktop, and then sync collection to cloud, which makes them appear on iPad. I might later rearrange order or delete some photos either on desktop or on iPad. Video is example of one such attempt. Additions after initial sync would have to come from desktop, where raw images are stored. Have experienced odd behavior of sort order on iPad or iPhone only, never desktop. Currently iPhone behaving OK, but iPad reliably misbehaving. Don't know if it makes any difference that the collection shown in video is currently the target collection on the desktop. 

Surely by now Adobe realise that this problem is a software bug in Lightroom Classic. Why is it taking so long to recognise this and to apply a system upgrade to address the issue?