Hi,
Okay, so one major issue with your synonyms there is, that you are using space separators for both the keywords and the synonyms – and that is not allowed. The original JSON import feature can check for that, however the CSV can’t.
Please only use single words (no spaces) for both the keywords and synonyms. Using space separated phrases is not going to be possible for many reasons, which I rather not go into details, as it is a very complicated topic.
To resolve this, please delete all of the synonyms with the “Delete all” button, and use a single word version.