2 richter
This is happening because of two errors in the includes/languages/japanese/login.php file.
The white text is simply asking customers to sign in and is part of the HEADING_TITLE. However it drops down because that definition (line 11) has a line break in it (the <br /> tag). Replace this with a space and the first problem will clear up.
The second problem is that you have English text there. This would seem to be because the translation for split logins has not yet been done (line 14 and 17), though you should be able to simply insert the normal text from line 13 for the first instance, and I suspect that the second may prove to be more difficult unless Express Checkout is now available for Japanese customers.
BTW. Love the direction the site is taking. Wonderfully effective gradients.
Hmm. It might be too strong to call these errors. In designs where the header can expand vertically, the first would be fine.
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