Clicking Noise During Healing

Hi there.

I'm looking for some guidance. I've recently done my Level 1 Reiki attunement and I am starting to reach out to friends to start practising on them. Furthermore, I've recently purchased a new property. All the healings that I've done so far have received regular beneficial responses from my friend. I've done two quick healings in my new property (just around the head region) and both my friends heard a clicking sound coming from me... I've searched the internet but couldn't find any reference to this. They both found the sound on YouTube and said it was a slower version of this:

and it sounded like a click that an animal could make.

Could anyone offer any insight into this?

Thanks,

samjuel ✌