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Please post photos, and please treat shutter curtain (while in situ) like butterflys wing.
As you cock the shutter the gap/overlap between the 1st and second blind wont be necessarily be constant it may close slightly, can you see light through this gap. the shape of this light pattern will tend to be large and linear. Difficult to bodge this...
The cloth material needs examining carefully on both blinds from both sides as you wind on, as if the rubber matrix filler is badly damaged the fabric can leak. Torch in darkened room as the smallest pin hole can be a problem, the shape of leak light pattern will normally be small and well defined. Easy to bodge this...
If your camera does not have a send back warranty you will have to be patient as Michael alludes to...
Black multi ply wool may be easier to employ in seal areas, more compliant, you need small dabs of childrens glue to secure, in situ, dropped from pin.needle head.
Noel