Dear XingTong,
we also experienced this behaviour. As far as I remember, this was a bug with the scale [linear or logarithmic] of the path loss and the shadowing. Please set breakpoints at the calculation of RX_total and interf_power_all_RB in v1, and avg_pathloss_linear_0, avg_shadow_fading_linear_0, avg_pathloss_lin_i_calc, avg_pathloss_shadow_i_calc in v2, and check whether they are in linear or dB scale.
Best regards,
Martin.