BBT chart not biphasic?

I’m not sure what’s going on, but does this look not normal? I chatted my cycle (up to where I currently am) and it looks fairly odd. I chart using a two decimal place oral thermometer and get a reading between 6 and 6:30 am every morning before getting up. My cycles are typically 30-35 days long typically but I have been known to have a 50 or 60 day cycle every 4-6 months.