Bank nifty same movements different numbers, And turkish lira , sharp fall

I observe that bank nifty 28000 28500 etc are trading on different numbers but movements are same, how does this happen?

How could turmoil in Turkey have an impact on India and Indian currency?

Stocks- I observe that sometimes stock of a company falls dramatically downwards in a straight line by more than 50-100 points in few minutes, how does this happen?