Possible issues during assembly: «= The two boards can't be aligned at the same level. Holes on the boards and poles are not aligned, so screws can't be installed. « Please slightly loosen all screws and adjust the boards. Because the diameter of the holes on the pipes is 2-3 mm larger than that of bolts, the position of the boards can be adjusted. = If it still doesn't work after adjustment, please contact us for more solutions.