Error message is showing in the form even if the date field is filled

it also says this even tho dates have been filled out correctly 

ERROR: Returning On date should not be earlier than Departing On date.

It's actually a text field, you have it as a custom error message in the form. It's showing up in the form because your conditional is set to show it when the calculation is equal to zero. 

 

The total is a calculation of the two date fields in the form. When the second date field in not filled, the error will show up. I think this is also causing the issue with the page break. Please check. I would suggest revising the condition or remove it.