If Markieboy's current type given by his profile is correct (B744) then this FMC certainly does have a LEGS page. I would agree with the other posters that F390S has been entered against a waypoint on that page, and the FMC is being forced up at a position that is 68nm away.
I never flew this type on metric flight levels, and am willing to be corrected, but with FL348 (ie FL10600m) entered as the CRZ level and the step setting to ICAO (ie 4000') would the FMC not plan for the next level to be F388? If this assumption is correct, the explanation that FL390S has been entered manually has even more credence.
Markieboy, did you clear this step by re-entering the CRZ level after you had passed the waypoint that is 68nm away on this picture? I seem to remember that sometimes an unwanted manual step won't clear from the 'Step-to' field after the associated waypoint has been passed even by entering Step 0. The solution was to hold the present altitude, dial a lower one into the MCP, push the button, redial the current altitude and push the button again.