Matthieu Waldburger 

This article may be worth a read... it is old and I have a feeling parts ofit may not be relevant today but it will give you a better understanding of the concepts I hope:

https://multifarious.filkin.com/2013/02/13/100percent/

In your example the main takeaways are probably this:

• you have a penalty preventing a 100% match being 100% in the TM Results window
• since both are really 100% matches they can be considered as a potential Context Match
• The result in TM2 must also contain additional information in the TU that makes this the preferred one in the context of your file (see the article)

Perhaps that will shed some light on things and you can be more specific if you still have questions.

 Matthieu Waldburger 

I do not speak and understand French, but I'll try to explain using English and German, while I suppose the situation in French will be the same.

Imagine you have to translate the following text:

You see a window.
Click it to select it.
You see a button.
Click it to select it.

As you can clearly see "Click it to select it." is a repetition. So in first attempt this will be a 100% match from the TM:

Du siehst ein Fenster.
Klicke es, um es auszuwählen.
Du siehst eine Taste.
Klicke es, um es auszuwählen.

Now the "Klicke es, um es auszuwählen." does only fit for the window (Fenster, das = Neutrum). "Taste" is Femininum (Taste, die). So the second occurrence of "Click it to select it." must be translated in German to "Klicke sie, um sie auszuwählen."

Now we have this order in translation:

Du siehst ein Fenster.
Klicke es, um es auszuwählen.
Du siehst eine Taste.
Klicke sie, um sie auszuwählen.

And our TM contains now TWO different translations for "Click it to select it." If your next document will contain this:

You see a picture.
Click it to select it.

your TM will give you a 99% match for "Click it to select it." due to multiple translations penalty.

But if you get this again:

all will be context match.

The explanation is: The first sentence is the same as in the previous document. It has been translated exactly the same way as in the previous document. And the document structure level of both source and translation is the same, i.e. heading or list item. The next sentence is the same in source as it previously was. The previous sentence is the same as it previously was, has the same translation and the same document structure level. So TM can decide, which one of the multiple translation proposals does fit here.