Time series with irregular dates seems to be summing up certain values

[OwenMulhern23]

Hi! 

I'm charting open rate over time for emails. 

All of my open rates are below 0.75 (i.e. 75%), but when I chart them, I get spikes above 1 and even 2. 

I think it's because sometimes, more than 1 email went out in a given period (like maybe a week) and instead of creating individual points along the chart for each of these, it's summing the available values for each given period (probably week).  

I hope that makes sense. 

Either way, can someone confirm? And if so, help me figure this out? 

Many thanks.