Weird WiFi and DNS issue

You should set up a Network Location File for each different Wi-Fi Network you use.

For the one for Starbux, exclude the work network entirely.

How to use network locations on your Mac - Apple Support

.

The "trick" is that you create MULTIPLE Network Locations. Once you get the settings correct, You don't have to remember what to change (and change back). It's a cinch to change to a new (pre-set-up) location:

System Preferences > Network

just choose Its name is in the box at the top, labeled "Location", and ALL the settings are applied at once:

.

why is it that the network configuration setting for work are sticking to the interface

This happens because you entered them manually for some reason. Sometimes the reason is that the Router did not supply them, or the Router supplied ones that are annoying to use.

If you clear them out in every case, it should let the Router supply them. If you use Network Location Files, you can do it either way for each Location, and have that setting saved and applied all-at-once.