Unsolved Mesh turns wired when I turns combine to another mesh

So I mirrored my mesh then tried to combine it to another mesh then this happened


Before combining them together it looks fine

after combining them it turns wired and shit

 

...wired? wat?

 

Do you mean weird? That's the normals flipping for what ever reason, go to edit mode, select all and recalculate normals (was it ctrl+n?).

 

no.

 

you can also go to a tab on the left (i believe shading or uvs or something) where theres a button to recalculate normals

 

Yes, it is Ctrl+N to recalculate normals and Ctrl+Shift+N to reverse the normals.

 

If it's not flipped normals, you've got double faces than