It can be confusing logging into a store if you have a personal account and a store.
When logging into a store be sure to enter 'User Name' and password. Do not enter email address in the 'User Name' section. You may be sent to your account rather than your store dashboard.
This is the landing page you will see if logged into your store dashboard correctly:
When logging in to your account enter your email address and password.
This is the landing page you will see if logged into your personal account correctly: