Solved

Cars disqualified

Hello,

In iGP Manager, dry races are defined as those that are dry and 0.0mm throughout.
The track's water level being 0.1mm or greater does not automatically mean that the race is declared wet - rain drops have to fall after lights out for tyre rules* to be deactivated.
In other words:
Due to wet races being defined the way they are, you may have a race start at 1.0mm, and dry all the way to 0.1mm be defined as a dry race as rain never actually feel during the race.

In the race affected, did rain drops fall after lights out?

Thank you.

*EDIT: Just to confirm, by "tyre rules", I mean the requirement to use at least two different dry types of tyre (for example SS and S). Intermediates and wets are not classified as dry tyres and therefore do not count towards tyre rules.

Second Edit: Intermediates do count as a 'dry' compound if the water level is above zero at the start of the race, even if it doesn't rain between lights out and chequered flag. 
Thank you SMod Kevin for pointing this out. 

Thank you.
I have just edited my response to make it clearer.