Mesh keeps glitching when uploaded to studio..

I uploaded a little video. You can skim through it. It just shows the visual glitching in Sims 4 studio. I'm not new to making custom content and I've been having this problem lately where every mesh I upload. that's brand new it. visually glitches in Sims 4 studio and it almost like it overlaps with the rig that is in Simport Studio. Doesn't matter if it's a flat. piece of custom content like a shirt or underwear or something I needed to create a mesh with in blender, When I go to upload the mesh level of detail, the vertices and polygon doubles to what it should like a normal shirt top with no mesh. is 600 vertices and about 1000 Polygons and that's for every swimsuit bottom like. pair of leggings or anything that doesn't have a mess and. when I'm uploading lately it almost doubles. to about 2000 vertices and 2500 polygons when I'm not uploading a literal mesh I'm literally uploading a pair of panties. and I know on clothing. you take your item especially if it's flat and you upload it to a nude top or bottom and then you fill out the information. and publish it. so there's been no rig to upload because it's a flat piece of clothing but I'm trying to upload a dress that I made and I cannot get it to work. It keeps doubling the vertices. and this is only on level of detail zero. when you look at level of detail 1, the mesh is fine. There's no visual glitching the Poly count is where it should be. It's only on LOD zero. I triple checked my mesh and I remade my mesh 3 separate times appending it to nerd rigs. and uploading it to bathing suits in the. full body clothing section since there is no nude swatch to upload anything to and since our studio for a full body outfit. I've done this 3 times on 3 separate meshes starting from scratch, redoing my UV layout and unwrapping everything and going through the process and I keep getting the same issue. So I'm gonna upload my video here and y'all can tell me what I'm doing mom because it's bothering me and it's not just this latest mess. It's every piece I've been trying to do lately. Maybe my Sims 4 studio is the wrong? There's no reason things should be doubling up poly counts when I try to upload my LOD 's. I'll include the video package. file my UV layout, my blender file, all of it. 

VIDEO OF ISSUE


package file      ;;       UV file         ;;         blend file





I used talk to text to write this paragraph out, so if it doesn't make sense, please excuse me.