Maybe down to your hours. You are then operating 3 sectors. MAN-MUC-LCA-MAN. This reduces the amount of hours you can operate, as well as taking into account the time you checked in.
Once did a MAN-TFS-MAN. Divt to LGW due tech. Due the late hour we checked in and with us now doing 3 sectors our duty time was then cut down. we didm however operate LGW-TFS-PMI where a new crew took over and we positioned as pax on the aircraft to MAN.