Signals Flashing but No Click?

[Angry Rabbit]

I've just installed new turn signals and solenoid. When I turn the key, all 4 light up as expected. When I turn on the RHS signals, they flash fine and the solenoid loudly clicks away as expected. However, when I switch to the LHS they flash but the solenoid doesn't make any clicking noises.

I guess I can't complain because the flashers work, but is this a symptom of another problem coming my way? Thanks in advance for the help.