I believe that refreshing your local configuration files for Steam might solve problems you're seeing.
Please click the following link and confirm the prompt within your client - that should refresh configuration of your client.
Link - clicky:
: If you have multiple installation folders for games completing this process will remove them.
Perform the following steps to add extra installation folders in your Steam client:
1. Open Steam
2. Click Steam > Settings (Preferences on Mac)
3. Navigate to the 'Downloads' tab
4. Click the 'Steam Library Folders' button
5. Click on 'Add Library Folder' and add the directory that contains your games
6. Click 'OK'
7. Restart Steam