Hard to say what they used. Unfortunately, You will have to pull the hatch and any other areas affected and reseal. I would use butyl tape and a exterior sealant like proflex to seal things up. Do it now, not later.
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2017 Salem Villa Estate 395RET-
2011 Coachmen Freedom Express 295RLDS- Sold
2015 F-250 FX4
The Proflex is the perimeter seal. The butyl tape is between the window flange and the aluminum siding.
EDIT: Thinking out loud... You might want to contact MFG to see what they recommend. The butyl tape is thin and might have issues sealing the "hills and valleys" on aluminum siding.
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2017 Salem Villa Estate 395RET-
2011 Coachmen Freedom Express 295RLDS- Sold
2015 F-250 FX4
My thoughts exactly. Bad batch of caulk? Wrong caulk being used?
The clear silicone on the perimeter seams fine. What ever is on the stuff between the trim and aluminum is expanding and dripping.