Wrapper HTML No hyperlink output

Hi there,

I am using the pro version of Post Grid as well as the ACF plugin. I have a URL field ([ext_link]) which I want to display. I am using the ACF URL field to connect with the [ext_link] field from ACF.

When I type "Visit link" (without quotations) (https://bit.ly/3tYdeA9) in the "Wrapper HTML" field, it doesn't work. On the frontside it display's "Visit Link", but with no hyperlink (https://bit.ly/3dZsoPY). Also in the backend when I saved it, it throws away all the code and does only display "Visit link" (with no html codes which I typed in before I saved it.) (https://bit.ly/3vrPV1P).

What's the problem here?