The overlapping order is the one in the first line? The overlapping bid/ask is the old one from @Darthcoin selling and buying CCs as 1:1 rate. It's arguably obsolete, kept for the records.

The chart and the whole order book, I'm sure there is plenty of stuff that could be improved. Considering I'm not a trader nor a dev, I'm pretty happy with the current results. It indeed needs much more work. Any contribution is welcome.