Hi Paulo,
From the screenshots I can see you are loading categories. Are those items from SDM? If so, it might be related to:
USS/Catalog category not loaded - CA Knowledge
If SDM is not involded:
Did you notice any error in the F12 Console and/or Network when reproducing the problem? This might help us to find possible causes.
If no error messages here and in the view.log/liferay logs then I would recommend you to create a case with support and provide:
1. Form as xml
2. .HIS from USS and Catalog
3. details of the data object called by the form.
Thanks.
Regards,
Pablo