First and foremost, I'd suggest making sure that you have the latest patch definitions on your console and agents. Help > Refresh files will update this on your console. Agents should update based on settings in your agent policy.
If you're using a distribution server for agents to obtain files, make sure the definitions are synchronized and also that all patches are downloaded in the console and synchronized.
This document might help:
Also, you might need to try clearing the retry count on the agents if a patch has failed to install too many times.
If you need further assistance with this, I'd suggest contacting support directly to work through any issue that remains.
Hope that helps! Thanks