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I've seen the same thing on some AT&T based custom roms for my Captivate.
Here's the solution to your problem:
Go to the google android market (I guess they call it the "Play Store" now) and download a free app called "Bookmark Sort & Backup".
Once you have that you can launch it and from there you can delete/manage bookmarks - even the "stuck" default ones that you see in the stock browser.
I agree you shouldn't have to jump through these hoops and those junk bookmarks make the concept of "bookmarks" useless by cluttering it up but this will at least solve your problem.
Actually, unless you bought the phone outright and unlocked (IE: paying $650+ for it up front from a retailer other than a carrier), you are renting the phone until your contract is up (1 month to 3 years if you got the phone from a carrier), so either way, you don't actually own the phone...
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