XServe and Mirrored RAID drives

I wonder if anyone can help me. An XServe of ours went down. It looks like it is the Logicboard. I have taken the system drive out and put it into a G5 machine and the OS opens fine. I took one of the RAID drives which were mirrored and put it into the second slot in the G5. The problem is that the drive did not have any of the files for the last 6 months. Then I removed that drive and put in the other RAID mirrored drive, and this drive had all the files on. I am a bit confused. If the drives were mirrored shouldn't the drives both have the same content on? Also if I change any of the files on that RAID mirrored drive will that affect the way the RAID is set up when I put the drives back in the XServe when my logicboard gets replaced?

Does that mean that RAID mirrored drives don't necessarily have the same files on? What is the point of calling it mirrored then. Also this makes no sense. Because isn't the point that if the one drive fails, you have an exact mirror of the drive to recover your files. How does this help, if a drive fails, and the other mirrored drive is missing files from the last 4 months. Luckily we have external drives connected to the XServe which daily backup the RAID drives on the XServe. But imagine if you didnt have this, and one of the drives failed.
If I had to reformatt the drives and then reinstall the data, would this possibly correct the weird issue with the RAID drives not being exactly mirrored?

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