I'm thinking Garmin error. We did a ride 5000 ft in 14 miles. If the OP did 7000 in 11 miles, his pics would be more drastic than mine below.
And to think a rail trail going up the grade of Baldy Rd, I don't think so.

...To get the 5000 in 14 miles, we hit plenty of sections 14-18%, to hit 7000 in 11 miles like the OP?