Welcome to the RbxDev forums. Could you give a bit more information about what we are reading. What is invoking Filter. Are it chat messages or just input that you use for gameplay inside the game world ?
If you reply to the email that Roblox will have sent you, they will point out where the issues are with filtering, I know it can seem like a slow process, but it is what I had to do to find out what the issue was in my place.
I have checked my email and did not receive an email sent by Roblox. I only received an automated Roblox message notifying me that my game has been placed under review.