Error: Difference between textbook and Memrise

I have chosen to learn portuguese (Portugal) over memrise.
Hower there are differences from what Ive learned at my language course in Portugal and the words beeing tought over Memrise.
E.g.: Eram, Eras, Era… They are completely different from my portuguese (Pt) Textbook! So frustrating - I supose Memrise is the faulty version!?

i think you should also give a link to the course you started


How old is the text book?