VB-601 Default BIOS Setup Problem

I have a VB-601V, when adding any new hardware, BIOS Setup changes to
the default settings (you press DEL to enter setup. On startup, I see
all the system defaults i.e. suggestion for Ram Latency and then
Win98SE startup, all devices are recognized and re-installed by
Windows. I've never seen the System Setup loose all the settings by
adding cards or new devices. So far system is stable. Is this normal?

PII-400 & ELAN CPU fan
128 mg SDRAM-PC 133
Diamond Stealth-3 AGP video, 32mg
Diamond 3D Lite sound card
I changed the backup battery