I am a beginner in the world of Vue, so please bear with my foolish question(s).
I have a boilerplate code for a Vue project which I cloned from:
Vue Enterprise Boilerpl
I think this is mostly a problem with the enterprise boilerplate code coming with a lot of UI styling already in place, and conflicting with the Vuetify button CSS or something along those lines. You're probably going to need to either choose to go with the enterprise template more completely (without Vuetify), or go with the more common Vue/Vuetify defaults. e.g. with vue-cli 3 installed, just:
vue create my-app
cd my-app
vue add vuetify
See https://vuetifyjs.com/en/getting-started/quick-start#vue-cli-3
I know this isn't particularly helpful in terms of actually answering the question you're asking, but my gut feeling is that you will probably need to either reconsider that approach and go with the more mainstream vue+vuetify, or ask the providers of the boilerplate for help when using an alternative UI library (Vuetify) with that specific site implementation.