If I have more than one entry in a given week, and I am using the track method, I'm getting a tally of that week's entries, as opposed to distinct entries. Don't know if that makes sense...
W1, D1 - I enter a value of 1000
W1, D3 - Enter a value of 1200
W2, D1 - Value of 1200
When the chart is rendered, instead of using a single value, or averaging the values from week 1, it uses the SUM of those values (2200). If I am using the "track" versus cumulative, this should be something besides the sum of those two values. I'm not sure the best thing to use in that case, but I thought I would point it out.