What does the color blue mean on this FMS? Data entered by pilot? In that case, the FOB would indeed have been modified by the pilot here to a value below the actual FOB.
Next it's just a matter of taking a picture before the FMS has realized what has just happened, and has not yet recalculated the EFOB at destination...
Next CLR the FOB-line, all's back to normal and you have a nice picture for PPRUNE... correct?