Hey there, Ripley67!
From your post, it sounds like you are having issues with using the Facebook app while a keyboard is connected to your iPad. We’re glad that you reached out to the Apple Support Communities. We want to try and help you find the answers you need.
What type of iPad do you use? Do you use an Apple-branded Magic Keyboard with your iPad? Here's how to check: Keyboards for iPad.
If possible, can you test another keyboard with your iPad to see if it causes the same experience? Does the problem happen only on Facebook or with other apps? If with other apps, which apps?
If you have not tried already, please restart the iPad. Does this help to resolve the issue? Often this simple step will refresh the apps and software on the device to solve numerous problems you may encounter.
Take care!