Solved

bugged setup

setup saved but in race itz medz, not only me it was another mate front runner as well was with rong setup

indeed i wasnt really attending race but was surprised BS was on meds. But just looking at BS setup in advance options it does have mediums selected.

so question is were does it take start tyre as priority from I.E start tyre or advance options tyre.

The first priority tyre is always the one you put as your starting tyre, but that is only if the weather stays as it is and it doesnt start/stop raining. If it does, it chooses the appropriate tyre from the advanced setup no matter if it stopped raining or started. So if you want to solve the problem I suggest you always take the advanced setup into account if the weather forecast is/has been showing a possibility for rain.

i deliberately selected the Interz as it jut stopped raining before race got locked, although the medz benefited me ele i could had landed way behind before first tint itself, intead it gave usedge over SS and we entered pit ahead of ss after 6 lap, yes we do used bit of drs & kers