Ace 570 shifting trouble

Hi All
I have an ’15 ACE 570 and getting the shift lever to find high and low gear is tough. The bike is stock with no modifications except stock rims and tires from an XP LE.

I seem to have 2 spots for H and 2 for L. Obviously only on of those clicks is the actual engaged gear. It’s the same with the bike running or turned off.
The last person to use it was a buddy of my nephew last year and I wonder if he shifted from Low to High under power.

Do any of you smart folks know what could be the problem? I have no problems pulling the trany and replacing a gear or two if I have to but I am hoping this is just a simple adjustment I need to make to fix it.
thanks for your time and effort.
Lynn