Yeah - they changed that in order to "fight" some chat abuse/trolling - unfortunately, they don't seem to have a better answer and we don't know if/when everything will get back to "normal".

it's new as of several weeks ago, and is hopefully only a temporary measure to deal with some chat abuse issues. they didn't bother updating the krill rewards page. you'll see the real 500 krill limit if you try to chat at the table and haven't earned enough.