The issue that in Mini-cart item display single (Unit) item price , as native Magento behaviour . Want to display item price row total (Unit Price x Qty ) in mini-cart when change the qty of the product it gets added into cart . Please check below screen-short.
https://www.awesomescreenshot.com/image/24827408?key=7fb4dcbf111bb8f3ec10ea9a00a4f971