Bobby I don't think you're dealing with a mirage. Wouldn't you expect the same effect to occur on the lower part of the Island on the left? They are very close to the same height. I think your are seeing the top of the rock on right due to refraction not mirage.
No doubt, refraction is making that island tip on the right visible, but an inversion layer is distorting it, as well as the portion of the island on the left that is coincident with the inversion layer:
The white line in the upper image is where I think the horizon is. Above it, to the yellow line, is real and what is being inverted in an inferior image from the white line to the red line, where an apparent horizon is.
In the lower image, taken from 400' higher, we can see what the islands really look like below that white line, and it's not what's in the upper picture between the white and red lines. The inferior mirage elongates, undercuts or even makes the tip of the small island appear to float. But that's because instead of the real image, it's an inverted image of the same band above the white line.
My question, without the inversion and it's inferior mirage, what would appear between the white and red lines in the upper picture? Would it be the slightly lower elevations of the islands? Or would it be the water line?
My guess is the waterline, which means the white line is where the actual horizon is and not the red line, which is the apparent horizon. The inferior mirage depresses the appearance of the horizon just slightly.