Tyres not heating up in rain

In this race, when i switched one of my drivers to intermediate tyres, the tyres remained cold continuously. My other driver was able to generate heat. Both of them changed to intermediates at the same time. What is the reason for this?

http://igpmanager.com/play/?url=race-live/18246/2d

Was one of your drivers set to a different push strategy?  That's one of the main things that will affect tyre temperature.  The tyre pressure setting for your cars also has an effect. The only other thing that would have a significant impact is if your driver with the cold tyres was moving much more slowly for some reason, because of significantly worn parts for example.

Thanks for the response Andrew.
I think there is no bug, i just checked the detailed race results again. One my drivers was on softs instead of intermediates. I thought i had switched both to inters but may be the driver was already in pits when i tried to change, so he continued with softs. That explains the difference.