If you select "all", there is no aggregation of the time series in each scout.
If a scout has 60 vertices, you'll get 60 times series in output for a constrained source model, and possibly 60*3 time series for an unconstrained source model.
Your 68 scouts probably have a total number of 14125 vertices.
https://neuroimage.usc.edu/brainstorm/Tutorials/Scouts#Scout_function
The label of each of these time series is available in the Description field of the file. You can identify which signal is coming from which scout with this information.