Moonlighting achievement not unlocking

Hi guys,
Anyone else having this problem?
Was convoy racing with my dad to get to level 10 in street racing. He reached that level before me.
For him, the “Moonlighting” achievement did not unlock.
Mine unlocked upon reaching level 10.

Tried to get him to level 11 in a separate session, but it still indicates 90% for him, even after hitting lvl11.
His gamertag is “Piet G”.

It triggered this morning.