The difference between the green line (observed ROI) and red line (luck-adjusted ROI) is supposed to have average value 0. In small samples from the same person or from different people, sometimes the green line will be far above the red line, and sometimes the reverse will be true.
I think typical differences in ROI between the red line and green line are about +- 100%/squareroot(n) after n tournaments, and it's not shocking to see a difference of about twice that. One of my students was ahead about 1% after 50k tournaments. Another was ahead 5% after 2.5k tournaments. Another was ahead 10% after about 500 tournaments. Others have been behind by similar amounts.
It is dangerous to extrapolate too much from a small sample. If you take a coin flip on the bubble and win, this does not mean coin flips on the bubble are safe for you.
If your red line is flat, you should look for leaks and missed opportunities even if your green line looks great. In fact, there is a slight correlation between your red line and green line. The red line is biased in the direction of the green line. If you get no cards or bad luck early, you can't use your skill advantage later. So, your red line tends to be lower when your green line is, and you should worry less about a flat red line if you are losing than if you are winning.