I had an active streak of 59 weeks. I have uploaded an activity - but the streak did not change to active (having the flame turn to orange).

In this support article I read that every activity during a week (starting Monday, ending Sunday) should count towards the streak. I can confirm that all of my activities have been 60 seconds or longer. I can also confirm I have done at least one activity every week; see the screenshot attached (from the desktop view)

I am adding an image from a friends account - to show the difference between the active and inactive streak. 

 Screenshot of my inactive streak

 Screenshot of my training calendar (desktop view) to confirm I have not skipped a week

Screenshot from a friends app that shows an active streak