I purchased two Hemnes 2 drawer (802-426-27) night tables. They were and are great. After a short time we decided we needed the 3 drawer version (104-834-70). I purchased two of these. Everything is fine, however the drawers on the 3 drawer units only open half way compared to the 2 drawer units. I have confirmed the assembly and it is correct. I have more accessible storage with the 2 drawer units. I have purchased numerous Ikea items in the past and never seen anything like this before.
What is stopping all three drawers are the length of travel of the drawer slides (or tracks). See the supplied pictures that I supplied. The tracks on my two drawer Ikea units are the full depth of the drawer. I suggest that the wrong tracks were supplied with both my three drawer units.
Thank you for writing back. It may be possible that the wrong tracks were supplied to you. For further assistance in the matter, you can visit us in-store with your sales receipt or contact us at 1-866-866-IKEA (4532). Should you decide to contact us by phone, we ask that you have your sales receipt in hand. Tack!