[Gautam]

As you have bbpress installed in forum directory, thats why its showing one more forum

if you have installed it in example.com, then only one forum would be shown

(though you already know this)

To fix this, you might do this (NOTE: I have not tested it, nor do I know if it might have a side effect on anything else, and this change will also be vanished when you upgrade bbpress):

Open bb-includes/functions.bb-template.php

Go to line number 711

This would be written there:

$link = bb_get_uri('forum/' . $forum->$column . $page, null, $context);

Change forum/ to category/ or anything you want.