So all is OK.
Note that the flappers do dry out and harden over time and should be checked as part of the typical annual maintenance. Also note that some of the Grady scuppers use somewhat uncommon diameter flaps. The kits you find from TH Marine for example, may look correct but may not fit correctly. A difference of 1/16 inch in diameter can make the difference between a working flapper and one that sticks either closed or open.
Of course the Grady OEM parts are an option but are fairly expensive compared to offerings from TH Marine.