Yes, I find it really hard to believe you started with an SG of 1.010. There's not a beer style out there with an SG that low. What was your recipe?
Regarding the secondary reading, if you have a lot of co2 in solution it will throw your reading off by as much as 10 points. You need to wait for a few seconds or minutes until the co2 comes out of solution. This is especially a problem on a beer that is still fermenting. I took a reading the other day tand the gravity said 1.010 in a beer still fermenting (lots of bubbles), a few quick shakes to release co2 and the reading was actually 1.024.