I just had new tires put on my 2018 GL1800 CSC trike. Today I tried to move the preload adjustment from single rider, to two riders since my wife was riding with me. Any preload adjustment other than the single rider results in the selection flashing. I stopped several times and tried to get it to stop flashing and the only way to do that was to go back to the single rider selection. I am under the understanding that a CSC Trike uses the standard preload adjustment. The trike ran and handled great. This does not seem normal however. Anybody have any ideas?