jquery.validate.js honores ignore setting only once. BUG ?

jquery.validate.js honores ignore setting only once. BUG ?

I use and like validate plugin. Now I wont use jQuery Tools 1.2.0 plugin Dateinput - <input type="date" />.
I need date format dd.mm.yyyy, for which Dateinput can be easily localized.
      
Problem arises when date is picked-up from popup calendar shown after clicking date input.
Validate plugin automatically performes validation and exhibits validation error, becuuse there is
fixed date format yyyy-mm-dd. Date field validation is not explicitly specified.

I set for validation plugin option "ignore: ':date'". When now one pick-up dade from calendar, validatin is still fired, but not executed, and date  is marked as validated. When date field marked as valid is again clicked twice (one shows calendar and the second hides it), without clicking on calendar (date value not changed), date field previously marked as valid is marked as to have the validation error!!!.

IS IT A VALIDATE PLUGIN BUG ?