Typical issues with cheap material/fabrication.  The hutch itself is very cute and our guinea pigs seem very happy in it.  The materials are not sturdy though and there were several issues with holes/screws lining up during the assembly.  The unit is not very sturdy but that is not a huge problem for how we are using it.  I did report the issues with the assembly to Wayfair and they did offer a reasonable partial refund in a timely manner which was a appreciated.