Steps to reproduce:
When you have a page full (or perhaps close) of disks. Select a disk at the bottom of the page. At the top the header changes to batch operations and the selected disk disappears off the bottom of the page. Now try to roll the bar down to the selected disk again.
Easy workaround to change the order of the disks by clicking something like pool to bring the selected disk up to the top.
Occurs in Google Chrome
Does NOT occur in MS Edge (Non Chrome version)
Internet Explorer is as usual Fubar'd and won't even open anything under storage or many others
Haven't tried any others
This is not in dashboard - but I couldn't find a suitable component. Tried Storage and GUI