Minor changes in default language

When activating Translatepress even some of the default language is beeing altered.
It is still in my language but I notice that some words are beeing exchanged with new words and the sentence then does not make sense anymore.

The default language should not be altered, so how do I stop it from changing these few words.

As an example I have a short snippet that tells the customer: “Free shipping if you order for XX more!”

However, the word “for” becomes “to” and the word “more” becomes “smiple!”
So it says “Free shipping if you order to XX simple” (all in my own language though but still it seems weird that it changes the default language.

Any ideas?