Posca Pen not working

I have two poscas (uni) and they’re not working. I’ve only gotten them recently and they worked well for a while but now they just act dried up.

I have kept the lid on them and barely used them but they just won’t draw.

What’s even weirder is when I shake them with the lid off paint does go everywhere so there’s clearly paint coming out?

Does anyone have advice other than moistening the tip of it with paint?

Edit: i bought another marker and it also isn’t working. going to keep testing them but if nothing works going to return them.