ACF post category – Posts are not saving first time It’s published

Hi, there. I’m developing a wordpress site and i’m facing an issue with Advanced Custom Field that I can’t figure out.

I have a category called “nature” and I have create a field using the ACF plugin and set the following rule: POST CATEGORY IS EQUAL TO NATURE.

So, everytime I create a new post and then, inside the post, select the category “nature” at the right bar, it shows the custom fields right away (like ajax or something). The fields just shows. I thought that everything was fine, but there is one important problema with that.

I fill the fields with information, upload images and so on and then I publish. But it doesn’t save the first time I leave the post. It just works fine if I edit the post again and retype and resend all the images and then update the post.

I’ve tried everything, but It just does not work. Can someone help me with that?

Thanks a lot.