I have the report published in Server and it worked correctly until yesterday (13 dec 2017). Now the report in Server is not correct, but in Power Bi Desktop it is okay. The screenshots of my problem: Server version (http://prntscr.com/hndy3j) and Desktop version (http://prntscr.com/hndyms).
More details about my chart (http://prntscr.com/hneau9). It consists of two line: orange line is today`s data, the black line is an average of 3 previous weekdays (historical data). And in Server version, this historical data is less than it is actually.
I have republished the report and it has been working until the first refresh and then the report becomes incorrect again.
Also, I have updated Power BI Desktop and it also does not help.