Different retraction settings when using multi-color prints

Hello,
I have well calibrated retraction settings for each filament so when I print this:

then I have no stringing at all.

But when I start to print multicolor prints then stringing comes back?

P.s. Maybe weird but standard retraction length is 0.8mm and for me for each filament it is 0.3mm ? Maybe something here is not good?

P.s.2 Filaments are dried, well calibrated.