WTF?

440743 gefest 7.0.27 2013-03-15 / 15:42:12 101:52:37 0 0 0
241365 gefest 7.0.27 2013-04-01 / 07:02:22 283:49:09 0 0 0
444563 gefest 7.0.27 2013-04-05 / 17:20:23 437:55:06 3,465 0 0

the same computer, there is no changes in BOINC software
i have 18 hosts with same problem (2x or 3x similar records)

If you are trying to sync hosts across projects (by looking at the BOINCstats host list) then you are going to become very sad very quickly. The projects do all sorts of wacky things with hosts, generating new hosts CPIDs and whatnot on a whim. There is also the issue of some projects not allowing merging or using different rules for merging with different versions of the BOINC server software. All in all, if that is important for you, you will probably spend a lot of time and frustration trying to keep them all together.

>generating new hosts CPIDs

Really? But last week I Crunch 2 of the project and only yesterday was duplication