[SLE] kernel modules from 2 kernel versions

I've got SuSE 9.0 using kernel 2.4.21-202-athlon. The sources are installed. However, in /lib/modules the directory is 2.4.21-215-athlon. I think it happened after a YOU update or something. I realized it when I had modules stop loading properly. Creating a link called 2.4.21-202-athlon and linking to the *-215 directory got the modules loading again, but now I have problems when trying to make and install things like Nforce or ATI drivers. Any idea what has happended and how to fix it.