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".

Home Depot trucks are configured this way. If I remember correctly, you need the hand held that plugs into the Curtis controller to change the configuration on this.

Can I get to that configuration through the Curtis Controller? Is that something I can get to without the handset that attaches to the card?

Sounds like a configuration in the menu
There is a setting to slow/stop the truck when elevated and not going straight.