P: Custom Order lost with slight accidental movement of thumbnail in filmstrip

Robert & John:
It sounds like you two are in agreement that this is not an Edit in Photoshop/return to Lightroom issue. Can we chalk this up to subtle unintended movements in the filmstrip? While Wacom may or may not be involved, its involvement is more likely to be the less precise nature of Wacom hover/drag when working with the filmstrip. 

John McNair & Nick Harrison - are you in agreement with this analysis?

As soon as the black bar between the photo shows up Lightroom assumes a move was made.  I agree with you proposal John, the sort order shouldn't change until an actual change is made.

For me I only have to move the image a small amount

 https://www.dropbox.com/s/nrgh4a68x7fkcoe/ScreenRecording2020-04-29at4.20.32PM.mov?dl...

For me I only have to move the image a small amount

 https://www.dropbox.com/s/nrgh4a68x7fkcoe/ScreenRecording2020-04-29at4.20.32PM.mov?dl...

"Adobe should correct this and make it operate where you have to move the photo more than a few pixels to change the sort order.  It is too sensitive now."

My proposal is much simpler: The sort order will change to Custom only if the actual order of the photos changes.

Currently, changing the actual order isn't very sensitive and requires a very large mouse movement. In the filmstrip, the mouse has to move 1.5 thumbnails to the left or right. In grid view, it has to move 1.5 thumbnails left or right, or completely outside the current thumbnail moving up or down.

This.  Exactly.

To add to my comment, I didn't see if "bumping" was happening but it happened when you were clicking the filmstrip.

Unfortunately the video doesn't show anything about change of sort order after an edit in Photoshop.  I looks like it could be the issue of "bumping" the thumbnail a little and the sort order changes to custom when you don't actually move the photo. I have ran into this issue a few times.  If you click and hold a little too long and move or maybe something to do with the mouse click sensitivity settings then the photo will "bump" just a little and the sort changes.  Adobe should correct this and make it operate where you have to move the photo more than a few pixels to change the sort order.  It is too sensitive now.  

Here is a video of it happening.....run to 13:00 and you will see the sort change
https://drive.google.com/file/d/1q7yjgLvzM9MhtKnWA9eitVzOUhiiq6zE/view?usp=sharing

Yes, I agree this is probably the main issue

But I do not use a pointer (Wacom stylus) most of the time to pick images, as I use arrow keys to move from one image to another and keyboard shortcuts to open from LR to Ps

The issue also occurs without taking an image into Ps, just during use of LR