Mistakes happen. Prior approvals don't guarantee future approvals. The reason immigration journey includes multiple applications and interviews is because USCIS reverifies information at each stage. They may conclude that other benefits they gave you or your wife should not have been given. Maybe applying for citizenship wasn't the best idea. Many people call it the easiest step, but it's not true. Many issues can arise / be discovered during this stage. As one lawyer says, citizenship application is the last chance for USCIS to deport somebody.
Sometimes withdrawing N-400 and never applying again is an option. In many of those cases, at least in the past, USCIS would leave you alone.
This is not a legal advice.