If the high/ low values on your system have not changed even though they changed on your feed, Check from the following:

•  First, you must make sure that you are connected to your feed and not to another one from the Data Feeds tab in the System Options.
• Make sure that server time is correct since maybe on your timing you are in a new day and on server time it is still in the previous day. Because the high/ low values changes with the starting of the new day.
•  Otherwise, the high and low values in your system are the same as the high and low in the feed you are connected to.

And If the high/ low values are not correct on your system, check the high/ low values on your feed, because some times the feed application broadcast wrong high/ low values. To avoid this case there is an option on the Gateway application on the server side to broadcast the high/ low values as the bid rates of the feed move. To change it you will need to request from the technical support department to change it for you.