I think you might have made a math error. I would like to check your math.
Please post the diameter of both circles (radius is 1/2 of the diameter ), the average depth of each circle (measure the shallow end of a circle and the deep end of the circle, add them and divide by two then repeat for the other circle to get the average depth for that.),
the length and width of the spa and the depth to the seat and the depth to the floor of the spa.
Don't go by any printed measurements but actually measure everything with a measuring tape, including the depth of the water at the shallow and deep end of each circle.
Is your pool a true figure 8 or is there a longer transition section between the two circles?
Thanks.