Incorrect, it has always been this way. Maybe you have just been lucky and had loans taken out for the full time, but it's been like this for almost a year.
Then I must've been super lucky. Thus far when I have lent for 30 days, it always said "30 days". Now, since today, it was "2 days" and "5 days". During the past year I've lent at least a hundred times, probably more. It is possible this could have slipped through me a few times, but if it was often, it would be impossible not to notice.
I would say that at least 95% of the loans I set to 30 days get taken for the 30 days, maybe even higher.