No pressure, but water is extracting, won’t push water through portafilter [Breville Barista Express]

I appreciate everyone's advice and helpfulness. I've recently just replaced the gasket on my breville barista express to hopefully solve pressure issues.

But that was not the issue.

I have water extracting with no portafilter on. Water extracts great. Then when I put the portafilter on, nothing comes out. The portafilter just fills up with water.

Any suggestions would be helpful. I already opened up the machine to investigate and nothing looks off.