Hi Nicole,
The gasket may just need a littel time to settle into place, before you go installing the new gasket they're replacing this one with, give this one a little time in case it "settles in"
Even the tiny scratch can leak, however, through movement of the filter, the gasket will eventually adapt and cover that scratch.
The small leak you're describing likely won't create any prressure to blow off your sight glass, if you check it once a day and drain what collects, you'll keep it running indefinitely, and like I pointed out, it'll probably become less and less.