Share point "jumping back" directories on connected Macs

When some of our Leopard clients (10.5.8) connect to the 10.5.8 Leopard Server, the share point comes up fine and seems normal. But lately, as clients go a few directories deep, or even one deep, the open server window will sometimes "jump" back to that Mac's device window, which shows all the available hard drives and the Network icon. Or, it will "jump" back to the root of that share point, if the user's computer is not "checked" in the devices sidebar of the Finder preferences.

This seems to happen randomly, and the same directory that just got "jumped" back to the root, will not necessarily do it the next time. This behavior is happening only on clients running Leopard (but not all of them I am told), and I cannot get it to occur on the few Tiger stations in place there.

About the server: Mac Pro, 10.5.8 Server unlmited, AFP only. There are only around 20 clients who all connect under the same username.

I know I may not have described this problem very well, but if anyone has any thoughts, I woud welcome them.