Where did the market-price sells go?

A couple of days ago the shape of the 24-hour Lindex price graph on the buy/sell page changed. Until then, since buy orders had been added to the market, there were two lines on the graph. The lower line were trades by market-price L$ buyers who were accepting open sell orders. This had been running about L$330 this past week. The upper line were trades by market-price L$ sellers who were accepting open buy orders. They were generally about L$15-20 higher, about L$345-350. These two lines moved up and down somewhat but were generally parallel.

In the past couple of days, the top line has disappeared. Now we only see the bottom line. As a result, the graph is auto-scaled to be "zoomed in" more and the L$ granularity is more visible, so we see the graph looking like little steps up and down.

What happened to the top line? This line represented market-price sellers who were accepting the open buy orders. The buy orders are still there - at the moment, about L$70,000 for sale at L$345, L$150,000 for sale at L$346, etc. But the chart isn't showing any executions at these prices.

Is this just a glitch in the display software? Did they decide to stop showing the prices of buy order executions?

Or did sellers wise up and realize that selling at the market is stupid, that losing L$20 per sale is unnecessary when they can instead post an open sell order at the high end of the market range and get a quick execution? I'd like to think that this has happened, but it seems unlikely that everyone has changed over to this policy, that no one is taking the lazy but quick approach of accepting that L$20 loss to get instant execution.

Anybody know?

Just a small bug, i think. The graph was correct a few hours ago.