It's not an issue, it's physics enabled so it's meant to stretch open, unfortunately I can't finetune the actual hdt values because it's out of my skillset. If it bothers you too much you can remove the UUNP Special xmls listed in the requirements, or disable hdt entirely.
You accidentally left in the "folder_managed_by_vortex" files, also you could remove the meshes that you haven't edited (female armors, 1st person armors, weapons/shields, etc) to trim down the package
I've explained before why I "reject" it, as much as I would want it it's just not possible. Even in female body mods the most popular choice is to have animation-enabled anus bones, even though I haven't spotted any animator that would use them so far.