Hello @Luciano_Tirelli
that is pretty strange as guest users should be able to use them, meaning select an option from single-multi-select fields, enter date in text or number fields, etc
But have a look at these responses in another thread: Custom field visibility to guests - #9 by Emily_Roman,
Custom field visibility to guests - #2 by Emily_Roman this will probably answer your question.
Let us know if you have additional questions 