Hi LeeSister,
Thanks for using Apple Support Communities. We understand you're running into an issue with messages. We're happy to provide some information to help.
It looks like you may have already checked your text message forwarding settings, but if you didn't double check that your iPad is still showing as a device you can see how to do that here: How to forward SMS/MMS text messages from your iPhone to your iPad, iPod touch or Mac.
Are you only seeing this issue with one specific contact? If so, save the contact details and then delete and re-add that contact back to your iPad. See if this resolves the issue.
Thanks