Play Store tell me i dont have enough space

i have a Galaxy Mini with Gingerbread. Rooted. I was having trouble with disk space so i used a root uninstaller to remove a bunch of bloatware on a fresh install of Gingerbread. I still was unable to install more apps and was still getting a low disk space warning upon startup. So i uninstalled the uninstaller app and a couple other apps i had installed (titanium and ROM toolbox) and cleared cache in recovery. i no longer get told at startup that i have low space, but Play Store wont let me install anything. it won't even let me install the uninstaller app or the other two apps that i had. According to storage, i have 18mb left, which i know isn't a lot. But i don't understand how i was able to have some apps before, but can no longer install them again?

Not sure what other info you might need.

It also wont let me update existing apps.