I found this problem a while ago, but now that my zoo have big number of visitors it is causing crowded issues on some spots that have shops. I had to manually kick those from zoo (and that is over 500), one by one, and that was very frustating. This is big problem as if you don't react it will lead to a lot of congestion and other visitors can't reach the shops in time, so they will become hungry and thirsty, which leads them being unhappy etc.
Look in video
Source: https://www.youtube.com/watch?v=44Wrtk1ZQWI&feature=youtu.be
Look in video