Hi Valentiner,
you are doing fine!
It is my fault for not looking at your first post closely enough!
The waypoint "MENBO" is your "FROM" waypoint - you have already passed it. The waypoint "NORET" is your "current to" waypoint and "KISIL" the "next" waypoint.
The PROGRESS page is built like a standard ICAO position report that pilots had to make (and still do in some regions) where radar coverage does not exist. You would need to call ATC with a position report that would go like this: "Flight XYZ, position MENBO at 1558, estimating NORET 1602, KISIL next".
Airline pilots also use this page to fill out the flightplan when they track fuel usage. So you can use it to check how much fuel you had at the last waypoint (FROM) that you passed. Because often you forget (or are too busy) to read off the fuel right as you pass the waypoint, so you can use the PROG page to check it.
The fuel at MENBO should definitely be more than the fuel at your next waypoints, though - which is clearly a bug.
Cheers, Jan