Proteus - problem with voltage and current measurements
While I am not familiar with Proteus, some simulation packages will include a series resistance with the ideal voltage source. This is usually not an issue and helps the simulator solve "hard" SPICE problems like shorting out ideal voltage sources.

Going by the numbers, you expect 12.5 A, which corresponds to a resistance of 12.5 Ω. The actual current is 9.92 A, which means that the ideal voltage source is actually feeding 12.6 Ω. Your second figure confirms this, as the voltage across each resistor is 124 V, which is a reasonable figure if there is a 0.1 Ω resistor in series (1.2499 V rounded to 1 V).