This picture below $($see also the projector screen$)$ shows a short walkway connecting two buildings in company XYZ$.$ There are a set of doors at each end of the walkway. Here is a funny story told by an engineer working in XYZ when she used for the first time this walkway.

She was walking from one building to the other with a co$-$worker. They pulled the handles that opened the doors and went down the walkway. Upon reaching the other end, they again pulled the handles, but the doors would not budge. Assuming the doors were locked, they returned to the doors they originally opened to enter the walkway. However, when they tried to pull open these doors, they would not open either. They were trapped in the walkway between the two buildings! The engineer and her co$-$worker spent the next few minutes trying to signal to people though the windows in the buildings, but the people they signaled seemed strangely reluctant to come to the rescue. Finally, after trying the doors again, they discovered they needed to push the doors rather than pull them.

What is $($are$)$ design problem$($s$)$ with these doors?