Content Filter Odd Behavior

Running Openfire 3.9.1 with Spark 2.6.3. We configured and tested the Content Filter plugin (1.7.0) which seems to be working fine but we are seeing some odd behavior. Some users are reporting that they are getting the content filter message when they have not violated any of the rules I have setup. I have confirmed this by looking at their chat history and also by the fact that I was not notified by plugin that any rules were violated as it was setup. Any ideas on what could be causing this?