The issue is that a GCR for Diamond ZLFF Hunter is emitted at 40 parks and a GCR for Platinum ZLFF Hunter is emitted at 50 parks. These award names are reversed in the code. Hope it can be tracked down.
On a related issue, the mouse-over popup help on the button for selecting the ZLFF-H-… award shows Six classes including Diamond (40) and Platinum (50). These two are reversed.
It should show Platinum (40) and Diamond (50).