Can't access my website hosted in godaddy from 2 devices in same wifi

When i try to access my web pages (hoasted in godaddy) in more than one device (uses php and mysql) from same wifi network, Only one device is giving the response at a time. (At the same time i can access any number of them from mobile network). I didn't understand the reason for this problem. I have searched a lot about it on web but didn't find anyone facing the same issue. So what you think about this problem? How can i fix it?