@simon When trying this myself with your entries: exactly the same results as you found IF not logged into with my google account. Order doesn't matter, so it doesn't randomly alternate between bf or gf.
When I am logged in, all the sentences are translated as "My boyfriend ...". The default translation of 'Min kæreste' seems to be 'My girlfriend' until I add a verb. Then it switches to "My boyfriend" every single time.
Not sure what this says about my google account. 😅