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In the assignment editor, you have "from" column and "to" column, so when you specify nodes for both columns, this is a point to point assignment yes?
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Altera engineers have done their GUI for assignment editor that way; a spreadsheet table containing "from" column and "to" column. The two columns only apply for a path with source/destination. But for some assignments it doesn't make any sense obviously such as pins as you found out in which case one column applies(to). There are many others e.g. current strength or io standard. So it is matter of fitting in and a lazy shortcut from Altera's GUI engineer.
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