Sorry for taking so long to answer; been away~

Does it still happen and does it happen even if you click the "dev tracker" button to the right from the "English Forums" title?

Also to make sure, did you already check what "Forum Language" is actually set to in your "Settings" -> "General Settings" -> "Miscellaneous Options"?

One thing I might try after making sure that is set to English, I'd clear the cache of the browser if nothing else seemed to work.