OK... I found it. I still don't have a definite answer, but it looks like I did get the rewards for the GC. My last trip I bought a $50 GC (I thought I bought a $25 GC and thought it seemed like I spent a lot. LOL) for $47.99. I spent a total of $86.76 before tax (I'm pretty sure you don't get rewards on tax). 2% of that would be $1.74. The receipt said that as of that date I had earned $16 (rounded to the nearest dollar). When I went online it says to date I've earned $17.75. Without the GC I spent $38.77. 2% of that would be $.78. The most I could have earned for them to round down to $16 would be $16.49 (that's an assumption, but I think it's a pretty safe one) and if you add $.78 to that, I would only have $17.27
OK... It turns out I was wrong. On the receipt they don't round to the nearest dollar. I had $17.75 in rewards after my last visit, but when I went yesterday my receipt said I had $17 in rewards. I spent $71.84 before tax, including a $25 GC for $23.99 and today I had $18.71 in rewards, which is exactly what it would be if I didn't get the rewards for the GC.