Another thing to be careful with is steps throughout different softwares. So if I were to export an object out of Poser, sculpt it in Zbrush, and make some tiny tweaks to that Zbrush morph in Wings then load as morph target it would be fine. If however I were to export out of Poser, tweak in wings, then sculpt in Zbrush and load that in Poser it would explode. Certain paths will lead to scrambled vertex orders. Only trial and error can discover these things.

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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