Your explanation is not clear enough. Without an example, there is no way we can know what you are talking about. Also, the French course is almost flawless, so you are most likely mistaken when you say, 'it marks them wrong even when they are right'. We would need more details to confirm there is a problem in the course, or to tell you why you are mistaken, and you would learn from that.

I say that because for now it sounds like many posts claiming 'I typed a right answer and it told me it was wrong'. How can we help you if we do not know more than that?

Can you give an example?

It helps if you have a screen capture also. Make sure that you are using the correct verb with vous or tu.

Here is an example of what I mean

It is like a multi choice question. I ticked the sentence: vous mangez comme un cochon.

The following message came up: You missed one of the correct translations.

Correct solutions Vous mangez comme un cochon Tu manges comme un cochon

My answer is marked wrong. This seems to happen whenever there are two correct answers. Help!

make sure you are using vous for plural or respected (respected like referring to the president,you wouldnt say "tu est tres bon!",you would say "Vous etes tres bon!",hope i made sense)and tu for singular