server control Google map question

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C#

Ajax

Google-Maps

, +

Hello.
I made an ajax server control that exposes google map api. I made all and work good except onething, It initialize 4 google map at end.
All my server control event (PreRender,RenderContent,BeginRenderTag,EndRenderTag) raise once. but i don't know why it makes 4 copy of map with exact same settings(width,height,zoom,bounds ...)
I put an alert in prototype initialize and it has been shown 4 times.

What's the problem?

EDIT
I remove 3 copy of google map from document, but it send request to web service 4 times yet!!!

thank you!
ali