I have installed some soft via installer.app. after that I had to reset my device (settings and content) (there was a reason for that). Now my installer.app does not see applications that were installed by it although there are working and present on my springboard. installer shows the free space the same as it was before reset.

after that I deleted all applications besides installed.app manually via INdependence. And guess what?
Installer.app STILL shows the same 75Mb free (like the apps are still occupying their space in my iPhone's memory).

Any ideas?