Get a complete time & sales report on the stock and compare - that's the only way to really find what has happened. As I reported earlier I suspect they are including odd-lot trades in their OHLC statistics. This should be relatively easy to spot since it would be the only highest/lowest outlier for the day. Incidentally, the NASDAQ high for ECPG was $56.06 and NASDAQ low was $49.04. That's for NASDAQ-only trades.
I tried to get the data from eSignal in hope that i will not get the incorrect data (odd lot), but it didn't help, it still show the "odd lot"
I have asked this question many times to IB reps, raised tickets, but never got a satisfactory answer.
I do not understand how professional traders can trade with their charts, especially traders that rely on trend lines and support and resistance For example , see the chart of MPEL The high in the chart is 37.96 and the real high is 36.73, it is more then 1 dollar, a huge difference
i said it long time ago(i'm talking about YEARS,not months)-IB is using odd trades(as "much" as 2-5 shares) to define high \low of the bar or even EOD. good luck using indicators or whatever without prior filtering their data
i have a ticket open for a couple months. still waiting for legit answer with links from whatever party that regulates this s**** so far-nothing but silence,forget about info from legit sources