Our 390 has the same thing. My guess is that there is a single line to make it easier to get to the swim platform. We take ours down to swim and put it back up when we're done.
I was told one aft life line as the distancefrom the aft seat to the line does not exceedXXX inches. Kids can still fall through. Designed and installed a second lower safety line for abot $100USD.
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