Medieval wooden table Low-poly 3D model

Wooden medieval table made with maya 2017.

4 slight variation of stools with a single texture set and 1 table with his own textures. The table is 2k polygons on his own and each stool is under 400 polygons. The textures in 2k were made in substance painter and exported in pbr settings, I will gladly export in other settings and resolutions if the product is purchased. The wireframe previews have a glitch I've not been able to solve, they show triangles on the some legs of some stools but the models have nothing but quads. The problem is only in the render and not on the models themselves.