For US those are award classes, not seat maps, and F and J are different cabins. The airline may map F and J to the same cabin on some flights, but that isn't internal to EF.

With AY we cheat and internally use the PE cabin designation for one of those, however JL already has an actual PE cabin, so we can't do that.

We'll do some research and figure it out, however the original issue remains. When showing the "discount" economy seat map for JL, they may show those Occupied seats as Blocked, implying possible availability later where there is none.