3.1 problem with profile rewriting

Hello people!
On my forum i have trouble with people having almost the same usernames.

Here is an example.

Member 1: Volvo 142
Member 2: Volvo-142

They get the same userprofile. This didnt happend before i upgraded to 3.1. What should i do?

I used the same settinga fr 3.0 and 3.1 so it shouldnt be any problem?

The url for Volvo 142 user profile is Bilforumet
The url for Volvo-142 user profile is Bilforumet

So its a different url. But it gets to the same profile.

Bilforumet

Hello,

it is suggested to include [user_id] in member profile URL formats to avoid possible conflicts.