I wonder if one of your other distros might be Debian based?
I ask this because when I (years ago) mixed PCLinuxOS and a Debian based installation, there was a problem. The particular distro was Klikit Linux - which was based on another K version of the U distro. Somewhere in the /etc/rcS file, there is a line which reads
UTC=Yes. That had to be changed to UTC=No. Before that change was made, because we are normally 12 hours ahead of UTC here in NZ, it threw PCLinuxOS out by 12 hours each time I returned from Klikit.
I can't be certain exactly where the file is - somewhere in /etc - because it is years since I had such a distro.
Of course, now that I use nothing but PCLinuxOS, the problem doesn't arise. I suspect that the U distro had the same UTC problem.