property error message hides page error message

When a section is submitted, in post processing part, a data transform do validation.

Some errors added to a property by pxAddMessageToProperty

Some other errors added to page by @pxAddMessageToPage

I found if any property error msg, the page error msg will be hidden.

Only when property error is corrected and resubmit, page error msg can be seen.

May I know why? How can I see both type of error msg?