Memory that can't remember.

Your memory is fine.

What you have, is the long POST (poer on self test) mode enabled in BIOS settings.

In the days of small amounts of RAM, it was common to set the memory test to the long mode to allow the PC more time to stabilize before loading the operating system.

If you want to stop the 3 memory tests, you need to enter BIOS setup when the PC boots.
Find the memory test setting (usually on the second or third screen)
Then enable quick test, or disable long test.
Save settingsand exit.

Your memory should now only count up once.

Note: if this is a recent change in the behavior of the computer, it is possible that the CMOS backup battery needs to be replaced.
On many 486 systems, the CMOS battery is a NiCad cell soldered to the motherboard. These are not "user" replaceable. (They can be replaced, but it is best to have a technician replace it)
If you are lucky, you have a coin-cell battery in a holder that you can easily change yourself.

Chas