This can be quite normal. Imagine this: you install a ceilingmount beamer/projector, you WANT your image to be upside down. Maybe this amiga was used for exactly this kind of thing.
Does the A2000 have a harddisk? If so, if you boot from floppy is it the right way around?
There are several utilities for flipping your (WB) upside down/left to right etc.
If all is normal when booting from floppy have a close look at your startup-sequence.
