Quote from TradingWise:
Press the two icons at the top of the chart to show the bid/ask price.
I see what you mean. I clicked the show average price and the candle now follows the price. But the average price at the time is still different (higher in the case of a sell trade) than the other brokers who are using the bid to follow the candles. This 1/2 spred (especially in wide spread, high volatile periods) seems to be to Oanda's benefit. Seems to me, tell me if I'm wrong, that Oanda stands to profit by the spread and then again by 1/2 the spread.
Wow, I just used around $50,000.00 of Oandas play money and took profit of $1,100.00 on a $1,500,000.00 AUD/JPY buy trade from 22:29 to 4:16, Aug-16,17. Wish I had that kind of real money.

