Do you have 1080p24 turned on in the PS3 menus? It's likely that the console is "handshaking" with the projector to find out its maximum accepted resolution. When the projector confirms that it can accept 1080p24, the PS3 sends it that way.
I don't have a PS3 so can't tell you exactly how to turn this off, but on other Blu-ray players there are separate settings for Resolution and for 1080p24 yes/no.
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