I bought 4 last week. Apart from the glass door, the sides and back are not fastened by any kind of screw. The top and bottom wooden base that hold the frame together are tightened with bolts on both top and bottom. If the top and bottom screws are too tight it might create pressure on the glass as it could push the top and bottom of the glass and press on it causing pressure and make the glass want to “bend”.
Bottom line - don’t over tighten the screws.