I was having serious control issues with my new FaderPort 16 that I bought a few weeks ago. I may have inadvertently messed up the settings myself as well. Nobody could tell me why I could only get my FP16 to respond to S1 on 8 channels instead of all 16 channels.
So, I took matters into my own hands. I followed the instructions in the manual on how to set the FP16 to work with Studio One. If you are not using Studio One software, there should be instructions on how to configure for Pro Tools and several other DAWs.
After that, the scribble strips had several menu choices. One of them being "Reset to Factory Default" (or something equivalent). I performed that task. It was a bit confusing because the unit would blank out and I wasn't sure if I needed to turn off. So I turned off and then back on. It eventually went through a lot of movement of my sliders. Once they stopped, the reset was complete.
I then clicked on "Settings" in Universal Control. I saw a menu item for "Update". I discovered that I had an outdated firmware in FP16. So, I selected that option. It took a little while, so I took a break and ate dinner. When I came back, all the scribble strips were showing that the firmware was updated successfully. I turned off the FP16 then back on.
At that point, ALL my control issues went away. I was so happy to find that I could now use all 16 channels of the FP16 instead of previously only 8 channels.
I am not sure if the FaderPort 2018 steps will be the same for you. But it is worth looking at this process and see if it helps your situation.