Wirelessly posted (8700g: BlackBerry8800/4.2.1 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/102)
I don't know why DM doesn't show your installed apps, but try closing and reopening DM and rebooting the BlackBerry and trying the App Loader again.
You can always uninstall from the BlackBerry at Options > Advanced > Applications. Select and delete. Reboot.