Another way to tell if the vertices are out of wack is to export the mesh with all options unchecked, reimport with weld identical vertices checked. After you've done this, run the smooth brush over the former seam areas. If the seams part then the weld didn't take, which indicates that the vertices do not occupy identical v coordinates and weld identical could not weld those vertices. As an aside, I find weld body part seams on export to be pretty useless or at least not as revealing as weld identical on import.

---

W10 Pro, HP Envy X360 Laptop, Intel Core i7-10510U, NVIDIA GeForce MX250, Intel UHD, 16 GB DDR4-2400 SDRAM, 1 TB PCIe NVMe M.2 SSD

Mudbox 2022, Adobe PS CC, Poser Pro 11.3, Blender 2.9, Wings3D 2.2.5

My Freestuff and Gallery at ShareCG