It appears that you created the seed face and transformed it while the simulation time was at 100s. If you do this then it will animate the face, i.e., it will move with each iteration. If you want to create geometry and transform it after your simulation has run then:

1. Save a copy of simulation so you don't corrupt the complete solution
2. Toggle the Lock button
3. Click the Start button to return to time = 0
4. Create and transform your seed face
5. Create your particles as normal
6. Toggle the Unlock button to return to the end of the simulation

In its current state you should delete the animation transform. Select the Time:100 property (pink highlight means it can be deleted) in the screenshot, right-click, and select Delete. Then perform the transform again, given your simulation time = 0.

You don't have to create seed geometry if existing geometry that is part of your flow volume is already in a good position. Instead just use the existing geometry as the seed.

Also you can release particles from an outlet and given that the default integration is performed both upstream and downstream the streamlines that arrive at that outlet from upstream will be created.