Folder Issue on Chromebook

Folder Issue on Chromebook

I use Nimbus Web on both my Windows 10 Laptop and my Chromebook. This problem has only happened on my Chromebook. I click on a folder to add or edit notes in the folder. The folder of interest is a subfolder. What happens is that the subfolder suddenly disappears from the main folder and somehow is moved to another folder. No idea why this happens, and it is frustrating because there is no easy way to search for where this folder has moved to. Eventually, I find it and drag it back to where it belongs. Nothing lost expect the time needed to deal with this issue. It is infrequent, but it is frustrating.