alot of orderpickers are and can be configured this way if operating in an aisle to keep the truck from driving when steering off center. I believe its called a 10 degree cutout.
It is an option so not ALL trucks have this, it seems yours does.
I'm sure there is a way to turn this off or disable it but would you really want to?
Check the dash panel to see if there are any enable/disable switches, one may be there for a manual disable mode when working out of the racks. Otherwise there may be some issue with the circuit when below 24".
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