Any ideas ?

[EINN-07]

This one is certainly a brain teaser !

Two Lufthansa Cargo aircraft,  D-ALCC and D-ALCG at the same FL and with the same squawk code ! There is probably only one aircraft but how did this happen ? 'Both aircraft' were on screen for at least 30 minutes. Only regret in hindsight is that I did not check when the signal dropped. The only way I can figure it happening is that one aircraft had two boxes with separate hex codes set or that somehow two separate aircraft had the same squawk code assigned, and I don't know if the latter is possible given ATC procedures.

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[Marinus]

My best guess is that something similar is happening as recently with
KLM B747 PH-BFG(484006) who on one transponder was sending the hex code
of sistership PH-BFH(484007).....

Propably a setup error, but can't tell you for sure....

Regards,

Marinus.