I found the reason.
Shai New Nude body ver.3 by Suzu (Not compatible with [Shai] Badakka bikini)
Suzu only made the part of LOD0, but LOD1 and LOD2 were not replaced.
So LOD1 and LOD2 are still vanilla body.
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So I adjusted LOD1 and LOD2 to be compatible with bikini.
If you want Shai's body to be compatible with Badakka bikini
Please download "plw_00_nude_0001.7z"
I need someone to help me test.
I've also noticed that many of my earlier mods had iuuse with LOD1 and LOD2 not replacing correctly. 
Looks like I need to spend some time fixing these issues.
"[Shai] Kibelius Divinus Outfit" will be my next fixed mod.
