Agree with
@Gwendolini - you should update if you can.
Assuming this isn't supposed to happen (the dots are a "feature" of the template of effect) then often dots like this indicate "no information." This can happen if the rendering (sharing) bit rate is too low.
Also, does it look like this on your system, and on YouTube, or just YouTube?
On second look, I am not completely convinced this isn't a "feature." Some of the dots are white and others are purple.