Color for published page does not update

Question

I built a web site in 2009.
I have just made changes to it in 2011.
I added 3 new pages, updated a few others.
I publish the site changes. Or I publish the entire site. Do each to MobileMe.
The updated pages colors turn from red to blue.
Then I want to keep a folder of the site, so I choose publish to a folder.
At this point, the updated pages turn red again.
I publish the site changes. Or I publish the entire site. Do each to a folder.
The updated pages colors turn from red to blue.
When I choose publish to MobileMe again,
without making any changes,
the same pages turn to red again as if they were changed.
And the same thing if I choose publish to a folder.
Why do they change? How can I fix this?

Answer 1

Yes I understand that.
But after it has been published once for each way and then I don't make any changes, they should not turn red and need to be published again. They should stay blue if I don't make any changes. Even if I switch the publishing mode.
I publish just the changes, then I publish the whole site. I send both to MobileMe. Then I switch modes. I publish changes and then the whole site to a folder. Everything is blue. Then if I switch back to publish to MobileMe, the few pages turn red again, after they had been completely blue after publishing them the first time. I don't think that should be happening. It acts like something is stuck.