This is an indication that not all the various computers and modules are talking to each other properly. Presumably yours is a 2b (big headlamps) so would be full CanBUS system.
That's got you, talking geek.
The car electrical systems are controlled by a body computer, which talks to various 'nodes' around the car, such as each door, lamps, tailgate, etc. Plus others. If something has been disturbed or changed, there appears to be an alien in the team, so the computer flashes the mileage to tell you.
It needs a 'proxy alignment'. This is basically telling the computer to accept all the currently connected nodes. Two ways to do this. Go to a main dealer. Ouch! Or use a wonderful piece of software called
MultiECUscan (search for this, or
MES, and read the various threads). Need the software, the licence, €50, and some connector cables.
Now, tell us where you are located. Quite a few people on here have
MES, and if you're lucky, someone will be near and willing to do this for you.