iK RTG: Using limb solvers deforms mesh

Hello, I have a problem using IK Retargeting with a specific skeleton and I can’t understand what the problem is

Target IK Rig: (Similar chains setup on source ik rig)

IK Retarget Base Poses

IK Retarget playing anim

In the image above you can see when turning on the IK phase in retargeting or in the leg chains, the legs are deformed and I am not sure why this happens, the same setup has worked for me on other occasions with other skeletons

If I turn off the ik phase or deactivate ik for the leg chain, the deformation disappears

  • I am not applying any specific configuration to any bones.
  • I am not applying any settings to the leg chains.
  • I am not using ik warping or speed planting
  • I am only applying specific settings to the Root and Pelvis chains, but I have disabled them completely and the problem persists
  • In the target ik rig I have a set transform that I have also disabled and the problem persists
  • I am using limb solvers instead of fullbody since it gives me better final results
  • If I use fullbody solver instead of limbs the problem disappears but as I mentioned the result does not have the quality I expect

I don’t understand why using limb solvers on this skeleton breaks his legs. If you can recommend what to do I would appreciate it.