If there are leaks, find the cause. Most likely, you damaged the seal and it needs to be replaced with a new one.
As you can see, replacing an old kitchen faucet with a new one is a simple procedure. The main thing is to follow the instructions and use high-quality plumbing materials. https://chatterchat.com/read-blog/58194_what-everyone-ought-to-know-about-bathroom-safety.html