This is known behavior in Windows when the option to "Open each folder in the same window" is turned on. To resolve, do the following:
1. Launch 'My Files' from HostNet
2. In the window that opens click on the Organize button on the top left
3. Select Folder and Search Options
4. Go to the top option called 'Browse Folders'.
5. Change from 'Open each Folder in its own', to 'Open each folder in the same window'.
6. Click Apply and OK.