I am facing the same issue. I created 3 text area fields for my Homepage but only the first one displayed the information successfully. I deleted all 3 fields and created new ones and once again, only the first one worked.
If I delete the <?php the_field('myfield'); ?>
and use plain text, it shows up perfectly in my site.
I tried debugging and I get NULL as a result on my site. I’m desperate, I can’t find a solution for this. No matter how many times I delete the fields and create new ones with different names, they still won’t work.