It is.
However, you should be able to set the "override" value for "CloudFsDisk_IsDriveRemovable" to "false", and it may fixe the issue. But the drive will no longer be treated as a removable drive.
https://wiki.covecube.com/StableBit_CloudDrive_Advanced_Settings
I believe that this is related to your windows settings for how to handle "removable media." CloudDrive shows up as a removable drive, so if you selected to have windows open explorer when removable media is inserted, it will open when CloudDrive mounts. Check that Windows setting.