Just a guess. DIDGO didn't appear on their flight plan, was not in their FMC on the legs page, (if they tried to put it in as a fix they may have mis-spelt it!), had to get the chart out, no not the High Level, the Low Level, after frantic search found DIDGO, typed it in and hit 'execute', sat back and breathed sigh of relief, totally unaware of the distress they caused you, Roger! Well, possibly something like that anyway!
. Is DIDGO a compulsory report point?
I've seen people take all the non-compulsory report points from the FMC to tidy it up and bring it into line with the CFP, which usually doesn't show them, only to find themselves being cleared to one of the deleted non-compulsory points! Win some, lose some.