I have the same mount with a c8.
The 9 is probably the slewing speed (1=slow, 9=fast). Perhaps you inadvertently hit a key, or combination and got into the slewing menu.
When I first got my telescope I found it easy to get into wrong mode/menu with the nexstar controller, esp slewing. As said previously, reading the manual is what I had to do - so I could get out of the wrong menu.
And I seem to remember some odd behaviours such as you stated - pressed down arrow and 9 was displayed, pressed up and nothing. It seems weird. But with knowledge from the manual all is well. I got my Advanced GT system about 3months ago.
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