This is where I described the problem. Lock sign on Superchart in Android - #8 by jstobaugh
It occurs if I leave the app running on my phone and minimized. When I go back the chart if looked at closely shows a time of when I last looked at it and not the current time. When I click on the hour, 6h or day it momentary goes to that but immediately goes blue back on whatever time it had been on.