Module disappear (not in “Not Installed Module”) after uninstall. BUG?

I upgraded my dolphin 6.0.5 to 6.0.6. All installation went on smothly.The only problem was the part that i have to recompile Orca Forum language file from admin panel -> Modules -> Orca Forum -> Manage Forum. When I did that noting happen. The screen went blank. When i go back and click on the Orca Forum I goes blank not even showing the parameters. so I decided to uninstall the Orca Forum and reinstall it but it gave me an error that "Even" and "Group" madule needs to be uninstalled before Orca can be uninstall so i uninstall all the 3 (Orca forum, Event and Group). To my supprise the 3 uninstalled madules completely disappeared. I believe there were suppose to go to the "Not Installed Modules" section right below the "Installed Modules" so that I can reinstall them again. Previously that is what it use to be but this time nothing is showing. The 3 modules I uninstall( Orca forum, Event and Group ) DO NOT show in the "Not Installed Module section" My questions are

1) Is this a bud in 6.0.6 or is was design to disappear or I did something wrong

2) How can I install those 3 module in they are not showing in the "Not Install Module " section

Hmm.. Where to start..

1st - The Forum displaying a blank page was probably because you are running a custom template. This could have easily been fixed.

2nd - Orca Forum does NOT require Groups or Events. So why this happened is completely beyond me.

3rd - If you are uninstalling modules from the Admin Panel and they are not showing in 'Not Installed Modules' then something is definitely not right here.

When was the last time your cleared your /cache (except for .htaccess) and /cache_public directories?

I cleard the cache and /cache_public directories (except for .htaccess) during the this very upgrade. it is in the instrctions which i followed. Now is there a way to install the 3 modules (Orca forum, Event and Group) without having to reinstall everything from scratch?