L2 shows green as buy and red as sell. Your two 7500 trades were red, indicating that you sold. I am not questioning that you bought, only sharing what my L2 screen showed when your two trades for 15,000 shares went through.
There are only two of my transactions that have gone through.
7500 at 10:22 and
5000 at 10:31
Both went through at .3805