I often wonder if the Green parties fracture along, for want of a better description, Hippy v Science lines.
In the past, the Greens tended very much towards the countercultural, alternative medicine, alternative living types of people. Nowadays it has increased its membership to a wider range of people but doesn’t seem to have increased its respect for scientific inquiry as much, except for where it agrees on climate science 🤔
I also think that in many European countries the Green parties have been subjected to entryism because they had a small membership and were easily influenced/taken over from the inside by people with a different set of social and policy priorities.