I need some help

KuraD Kuruta

Momo's Minion
First off, English is not my native language, so my apologize for any grammar mistakes and if it's hard to understand.

So, I've only started to get into MMD recently and made this model in VRoid. There're is a song I want to make cover of but the motion is rigged from Project DIVA and the motion author stated that I have to do some bones fixing in other for it to work on normal model and so I did.

Everything seems fine. It even fixed the body parts overlaps trouble I've been having except for the feet. They kind of sank into the ground and I don't know how to fix it. Please help.