I posted your pictures . . . but it's not at all clear to me what you are asking.

#1. Does the spa leak water into the pool, down to the pool level?
. . or
. . . Does the spa LOSE water, into the ground, down to the pool level?

#2. What is the elevation of the spa inlets, compared to the water level in the pool?

#3. Does the spa leak down ONLY with the spa pump on, or also with it off?