ET340 - Energy L2 phase measurement problem

In my system I have a ET340 for 3-phase measurement. My problem is information about Energy from the net :

com.victronenergy.grid Grid L1 - Energy from net 2622 uint32 100 0 to 42949672.96 /Ac/L1/Energy/Forward no kWh
com.victronenergy.grid Grid L2 - Energy from net 2624 uint32 100 0 to 42949672.96 /Ac/L2/Energy/Forward no kWh
com.victronenergy.grid Grid L3 - Energy from net 2626 uint32 100 0 to 42949672.96 /Ac/L3/Energy/Forward no kWh

and the sum

com.victronenergy.grid Total Energy from net 2634 uint32 100 0 to 42949672.96 /Ac/Energy/Forward no kWh

Problem is that sum of the L2 (2624) jumped down :

But sum (2634) doesn´t changed. Other two phases (2622 and 2626) are ok and I can’t see any jump down.

Any idea ? Is it wrong ET340 ? Or is there any other address where I can read a Energy sum for each phase ?