A warning appears during Stochastic simulation: Aggregate variance and sum of variances by shocks differ by more than 0.01%

Stochastic simulations
1

Hi,
I built a more complex two-country model, and when I simulated it, it worked fine, but there was a warning: Aggregate variance and sum of variances by shocks differ by more than 0.01%. What’s wrong with my model? Besides, is my simulation result credible at this time?
Thanks a lot！

2

This is a warning that can usually be ignored unless there are other red flags.

3

Thank you very much！