I thought Diaz's skin replaced a skin that appeared twice, but it replaced a kin that appears only once.
In left you can see the old Skin ID 106, and in right the new one (Diaz):
(https://forum.vc-mp.org/proxy.php?request=http%3A%2F%2Fthijn.vrocker-hosting.co.uk%2FVCWiki%2Fimages%2F3%2F34%2FSkin_106.jpg&hash=51776fff474609ba9b286b345cbbad046d77fd07)(https://forum.vc-mp.org/proxy.php?request=http%3A%2F%2Fwiki.vc-mp.org%2Fimages%2F3%2F34%2FSkin_106.jpg&hash=b1ec1b35495c0b15eb566edda99ca8edb645a347)
I suggest you to re-add the old skin with ID 106, and Diaz's skin to replace the skin with ID 130, because ID 130 and ID 171 are exactly the same.
Fixed in dev builds. However, there aren't technically any duplicate skins (ped models are all unique), so all special ped skins starting at 106 were shifted by 1 to accommodate the groupie ped (e.g. 106 Diaz is now 107).