Weird shapes on bakes mesh

Can someone help me identify or solve the problem for my 3D model in Substance Painter? When I import my model as an FBX from Blender, I learned that before starting to do anything you should bake the mesh. So, I baked the mesh, unchecked the normal and ID. But then (I suppose it's Substance) adds some weird triangles on the mesh. I tried to check if the problem lies within my Blender model, but I can't find any issues there, checked for double faces of vertices, I applied the scale and rotation and that doesn't seem to be the solution. Maybe someone here knows the solution? Thanks in advance!