One switch a foot off the floor seems odd, but it may be there for a jacuzzi "upgrade" in your bathroom. I have one of those - a mysterious switch that does nothing (and no, the neighbors' garage doors don't go up and down).

Don't be surprised if you find the outdoor wiring connected to an indoor bathroom GFI outlet. Yep - they wire them weird in Texas.

This is all in the new house, right? Maybe time to invest a hundred bucks or so in an hour of an electrician and/or a pool guy's time and have them check stuff out.