It's producing Elixir because it exists and that's what it does in your city.
It's also going to add some dust to that, becuase it has a different building touching it
It's also going to produce some gems, because it has a second different building touching it.
Those latter things are bonus productions, not the base production. The progress line is your base production line.
Mine will produce 8200 Elixir, and 8200 Dust, and 12300 Gems, and 1 KP
The quantity might be the same bug that causes many other things to pick a number based on the last building you hovered on, rather than the current building.