Why do you think there's a regulatory limit in the first place?
If history is any indicator it's a good idea to be more cautious than less
Now one testing lab in France says that one particular phone is slightly (less than 10%) higher than those already very conservative, cautious limits.
Most likely scenario: the testing lab used the wrong methodology. This is what happened in France many times previously.
Also possible: the testing lab is right, some phones are slightly out of compliance. They're still safe. The radiation levels are still way below levels that are even theoretically harmful.