Dynare++ check

Hi all,

In dynare++ when I use the check command, should I fin that the errors get smaller when I increase the order of the approximation? I would have thought that this must be so, but with my code I’m finding that increasing the order of the approximation (I’ve gone up to 8) seems to increase the size of the errors in one of the equations. This occurs for all three types of checks (shocks, ellipse, simulations). Does this indicate my model is somehow pathological?