Seasons changing too quickly

[GaelicVigil]

I recently started on a planet (first new game since seasons update) with a full rotation time of approximately 13 real days.  The problem is that the seasons seem to change extremely fast, each season lasting around 15 minutes or so.  It's extremely jarring to see multiple years (4 seasons each) pass by faster than a single day in my game world.

I understand that tilt plays into it, but my starting zone is temperate so I'd expect to see each season take about 3.25 real life days (13/4).  This appears to be a bug, unless I'm totally misunderstanding how seasons are supposed to work now.