Voxengo Old Skool Reverb problem

[Real]

Hello all,

Just recorded a simple Bongo track to which I would like to add a little reverb.

I'm using Voxengo's Old Skool Reverb and it's working for everything else I did so far, but this time, it's behaving very strangly and making a chirping song after each tap on the Bongos.

Unable to find what's going on.

I tried another VST reverb and the sound was ok (no chirping sound). I still would like to use the Voxengo VST that I find very versatile for my needs.

Any idea of what could be the cause of this?

Thanks
Real