Entering a bid on Gixen and the same bid on the eBay site.

[Matimu]

I have placed a bid on the bi en site.
Do I also have to enter the same bid on the specific eBay item page?

[Cupid]

The function of this site is to place bids for you in the last seconds of the auction.

So, no, you should not be also placing bids on Ebay as well, since that would defeat the purpose of placing your snipes via this service, so that others don't even know you have an interest in an item, let alone encourage them to place bids against yours.
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Mark