I dont understand?????

Im new at twitter and I made an account and once I did I logged out and wanting to go back into twitter but I put in my password it will not let me in and said that there was no match with our records please try again later. So I had to make a new account, did the exact same thing again for the third time I had to make an account and this time Im always logged in. Why, I dont understand ?

Nik2012+++ about X, v6.73.2