There are some commonly faced PayPal login issues that restrict you from gaining access to your account. So, in that case, you can try the solutions mentioned below:
Try to install the updates of your web browser, the PayPal application, as well as the Operating System of your device to get rid of any bugs or issues.
Clear browser cache and cookies
Sometimes, the long-stored browser cache and other junk files available in your device may cause problems while you are using some of the functions or programs on your device. Thus, it is important to clear them off for smoother operations.
In case you could not log in with your current login credentials, then you should try to reset your account password or recover your username from the PayPal login page.