After installing the package and setting it up through the tailwind config it was creating the font size as following :
font-size: clamp(20px) calc(20px + (30 - 20) * ((100vw - 320px) / (1230 - 320))), 30px);

It works perfectly fine whenever I change the value within the inspector tool :
font-size: clamp(20px, calc(20px + (30 - 20) * ((100vw - 320px) / (1230 - 320))), 30px);

My tailwind setup :

After digging around in the index.js I changed line 56 - 58 into 1 complete line :
Before :

After :

This generated the right value for me.

Did I do something wrong or has this occurred before? Thanks in advance