Problem Definition

When a user resets their password, they are asked to enter the new password once: 
Sometimes, they may make a typo in their new password (give a different password than intended) and use the wrong password to log in afterwards.

Suggested Solution

Add a second field in that form above, Confirm password, where the user has to enter their password for a second time.

Why this is important

This will make it less likely that the user enters a password other than intended.