Treemap weird behavior

Hello,

i can't find an answer to my question, hope someone can help me to understand.

I would like to be able to keep in the Treemap, only the elements which concern the month that I select in the column chart. I haven't made a Dax formula yet, I'm just using my fields from my table. But I have seen strange behavior when I select certain months, the Treemap sorts the items and does not highlight any, and for other months it highlights the amount that relates to the month. 

Example with highlighted amount in the Treemap (it happens for some other months too) :

Example with non highlighted amount in the Treemap (it happens for some other months too 😞

I don't understand this behavior, someone would have an explanation and could tell me how I can keep only the items which relates to the selected month?

Thanks !