Can someone explain why while i have an 80% minion critical chance, the character panel says 11%?

Nearly all skills have a base crit chance of 5%. "increased crit chance" multiplies that base value rather than adding to it. 80% of 5% is 4%, so if your only source of increased crit chance were that node that gives you 80% increased crit chance, you would have a total of 9%.

However, it looks like you probably have a separate source of either 40% increased crit chance, or +1% crit chance, which would add to the base to make it 6%. 80% of 6% is around 5% so that would bring you up to a total of 11% too.