wicking?
The water appears to be wicking though the cracks in the "putty". A vertical crack will allow water to come through due to gravity's effect.
I think that all of the existing putty should be removed and caulked with a superior caulking compound like GE's 50 year kitchen sink caulk.
You might also attach a water dam behind the hinge if the roof is allowing water to run down to the hinge area on the roof. Park the vehicle to minimize the roof's levelness issue.
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