How to perminantly delete Invisible bookmarks on IPhone

I've had invisible book marks appearing on my iPhone pages! They've been bugging me for years, I had the same thing on my iPhone 3G and when I upgraded to iPhone 4S it stoppe appearing up until six months ago!
I can delete them but every time I restart my phone it keeps popping up!
Please help me get rid of them cause they really irritate me!

Added (1). So they're not 100% invisible… They're transparent to be more precise!
And my phone is an iPhone 4S unlocked and have never been jail broken!

If they are invisible, how do you know they are really there!

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