Renaming a folder deletes/transforms it and I lose all the subfolders in it!!!

RH 2019.0.14 New UI

What's going on here ...!!???   I'm trying to lay out the skeleton of my project in Contents and am creating folders with subfolders. I can rename folders at the first level as 1_FolderName, but when I try to rename one of its subfolders, say 1.1_FolderName, or 1.8_FolderName the folder I tried to rename disappear, and its corresponding subfolders disappear and the folder icon changes to a kind of blank Topic icon. See folders 1.1 and 1.8 in the attached image. These folders get transformed, and I've lost their subfolders. 

All I did was select the folder > right-click > Rename and poof! ... RoboHelp majic at it again   😉 

What secret sauce am I missing? Thanks in advance for all help!