wp.org plugin SVN: screenshots aren't updated on plugin website

the plugin svn of wp.org has some kind of problem. since about a week my screenshots at the corresponding plugin website aren’t updated anymore. i just replaced some screenshots and committed them to the svn. then i’ve waited some time to let changes take place, but nothing updates. i didn’t commit anything else, nor did i change the screenshot names. i’ve already emptied browser caches, tested with other browsers, re-committed the screenshots etc. nothing helps.

could please someone explain me this?