Issue with CMS Import over witting values in one language over another language

Hi

We are doing some consilidation of 2 different installations where we now import content from one site to another.

1. First we import all pagetypes with "en" as the only lang to import, just so we can preview the outcome before importing all langs
2. Second we want to import "sv":
   1. We tick the "Update existing content items with matching ID" box
   2. We choose same location
   3. We select "sv"

BUT the strange thing now is that "sv" is indeed added with correct value BUT "en" is also updated with the values from the swedish translation:

Does anyone have any clue on how this behaviour is caused?

EPI CMS version 11.3.1