Shortcode not working

Hello everybody.
My problem:
I want to include csv files in Hugo tables and i have found a nice shortcode, which willl do just that.

But: after deploying the shortcode i do NOT see a table filled with my CSV Data but the HTML sourcecode of that table.

From what i have understood this is a common security issue an can be solved with markdownify, but i really do not understand how.
Can someone point me in the right direction?
Thanks alot!

It’s a little (or: very) hard to determine what’s going on. But, and I’m guessing here, you may want to look at

If it’s possible to share your site’s source (GitHub link?) it would be much easier to help you.