Are your values really totals per day? It looks like it's the total per order, with the date of the order.
The problem with your first graph is that you're not bucketing your values to totals per day - Open Flash Chart won't do this for you. You could do this as part of your SQL query (eg use DATE() to convert the datetimes to dates), or with PHP by parsing and reformatting the dates, and adding together values for the same day. Note that depending on how you handle the x-axis you might also need to add 0 entries for days without any orders.
The problem with your second graph is that you're setting one element per second, but your data should be per day. The important thing here is to understand the difference between line charts and scatter charts in Open Flash Chart. Line charts are plotted using a one-dimensional array of data points, whereas scatter charts are plotted with co-ordinates.