I'm not sure if residuals can increase during iterations. But, you can check if the residuals are acting at the scaled pelvis in the RRA actuators.xml file (Applies if you have scaled your model). You can also try using the suggested mass changes shown in messages section after your initial RRA run....

Hello all,
What is the inbuilt filter used in Inverse Dynamics?
We usually set the filter frequency to negative value if the data doesn't need filtering and around 6Hz if it does.
Thanks in advance for the reply.

I have figured out few of the questions above and I post them for those of you who didn't know them yet. 1. It is always a good practice to make the force residuals fall at least in that "OK" range given in OpenSim tutorials. So, I have changed the Actuators to act at the scaled pelvis COM. Here is ...