Google Maps API v3 repeats markers on custom map

I have this problem for a while now, I have searched the web for answers, but I could not find a good answer related to my problem.

You can see that I render my own set of tiles. The problem is that the markers are repeated horizontally, because of the wrapped map. I can't use the zoom in trick to avoid this problem, because the map has to be dynamic so it supports multiple resolutions.

I hope someone knows how to deal with this problem! I would really appreciate it.

I use Google Maps API v3.

EDIT

Here is another screenshot:

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