I3lock-fancy behaviour after screen wake-up

Good Day Labsters!

I have noticed some strange behaviour from i3lock-fancy lately.
When I lock my screen, it behaves how it should. The problem comes in after my screen has switched off and I move my cursor. Than I can see my last active window, in this case, Pale Moon. When I start to type my password, the lock screen becomes active again and shows that circle with the bars.
In other words, I lock the screen -> it blurs -> screen switches off, returns with my browser visible. Did the same experiment with Basilisk just now, I was greeted with a black screen upon screen wake up. Looks like an issue particular to Pale Moon.
I hope this makes sense?

Can anyone help me or explain why this is happening?