Hey Gabriel,
– Regarding the order of items on portfolio tag archive pages: please note that it is not a bug but rather an intended behaviour – sticky posts appear before everything else, as envisaged by the WordPress guidelines; however, if you wish the tag information boxes to appear first, here is a custom file for you: please download it, unzip the archive and upload the contained file into your theme folder.
– Concerning the second question: does the page including the header appear displaced permanently or only during the loading time? If the latter, then it is not a bug – the margins of pages in Ikebana are set by using jQuery to ensure that they are always in agreement with the width of the content; jQuery can only start calculating the margins when all HTML elements are loaded, which may lead to such behaviour.
Sincerely,
Andrew / Satori Studio