Okay so I just did a test.
First I typed out 2048 characters that were only letters. This was posted without a problem.
Then I typed out 2048 characters that were symbols ( I used [ ). This also posted without a problem.
However, when I tried a third time, posting
Code
[b] kl [/b]
to only 1700 characters, it told me it was too much.
So it's obviously the bb coding that somehow counts as more characters than it actually is... I would still post a site suggestion to get it fixed, cus it is a big nuisance.
Good luck.