I've gone ahead and created a support ticket for you and our Smart expert will be looking into this for you. She should be in touch soon!
The average on the Smart should be pulling data from the beginning of time, though it does leave out any days that are under a certain threshold -- I don't have the exact number of that threshold, but it's an extremely low number, one that indicates the user didn't move at all that day.
Drop us an email at customercare@striiv.com with your device ID and we can take a look at your logs.
Here are the instructions on how to get the device ID from your Striiv Smart pedometer:
Ccmcclare
I would like to know how the average is calculated on my Smart. I sometimes exceed the average and at midnight it might come out less than the previous day. Is it a rolling average and if so, what is the term length?