wtmp problem 2.6.18.x

[p1kus]

user L???? ... still logged in
user 0???? ... still logged in
root tty1 ... (32:59)
reboot system boot 2.6.18.1-grsec
........
test pts/0 ... (32:59)
root pts/0 ... (32:59)
root tty1
reboot system boot 2.6.18-grsec

I have problem with wtmp, when user log into system by sshd, wtmp (last) give strange messages as above, I haven't such problems with kernel 2.6.18 and earlier.
Maybe someone know how to solve it?

p1kus

[p1kus]

i should add also that when user log out "last" show him as still logged
and some strange signs are displayed insted pts/