Japanese 2 and up by Memrise - "te wa ikemasen" grammar

Hello!

I’ve noticed that there is used wrong grammar for obligation.

For example, in Japanese 2 level 23 there is a sentence: 私は傘を買わなくてはいけません which is translated into “I HAVE TO buy an umbrella”, but ~てはいけません means “must NOT”. Instead it should be 買わなければいけません (kawanakereba ikemasen), am I right?

And the 3rd course is full of sentences like this. :frowning:

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