Bolt, washer placed in wrong order of floor lamp
According to the picture, the order of the parts is correct. The small nut , the first item in the left side of the picture is the nut that tightens the whole lamp. The bolt you mention, is a piece of pipe Usually 1/8", so the wire can be fed through it to provide the electricity. The parts shown from the right to the left appear to be a spacer, a washer, and the nut. Tighten the nut as necessary being careful to not over-tighten. Make sure the nut is not stripped or broken. One last item, there should be a small nut on the top of the lamp assembly, just below the socket that you may be able to tighten also. Hope this helps.