Multiple instance previews' worth of logs can be bundled in session if the score screen is never loaded

[clpetersonucf]

Preview logs are stored in FuelPHP sessions based on instance ID. The logs for a given instance ID are flushed when the logs are requested by the API and pulled out of session. However, if you have logs for a given preview play already submitted (by partially completing a widget) then previewing again, multiple plays' worth of logs will be bundled together when the API finally receives the preview logs.