Hi,
Sorry for the inconvenience.
I checked your page and found that you are using the Feature Box addon. The link field shown in your first screenshot is not the button link field. Depending on your settings, it is used for the Feature Icon or Title link.
You can see the relevant setting here:
https://prnt.sc/wO6F46qqVSkQ
To set a link for the button, please scroll a little further down in the addon settings and use the Button Link option instead:
https://prnt.sc/m-8q8Ntofzf8
Please update the button link from that field and check again. Let us know if you still experience any issues.
Best regards