Will a high exchange rate in currency be ignored only because it appeared shortly?

On 8Jun, I got a USD/MYR currency exchange rate of 3.5460 through http://www.xe.com/ict/, however when I referred to the historical data in other website such as:

http://www.fxstreet.com/forex-tools/rate-history-tools/

and other websites illustrated by graphs, neither of them showed 3.54.

So just wondering is it possible that a rate will be ignored only because it appeared shortly?

Also, if I am looking to trade with bank, which website suit me better considering the above 2 links.

Sorry if it sounds like a stupid question.

Big thanks for help.