Why does the group head keep dripping?

[Charlene Hohulin]

I put new rubber seals and I thought I had it fixed, but the right side started dripping again. Any suggestions?

 

[cafemakers]

I put new rubber seals and I thought I had it fixed, but the right side started dripping again. Any suggestions?

Wrong size group gasket? What type of machine?

 

[NW JAVA]

Are you sure that rubber is seated securely ( flat with no bulging)?

 

[NW JAVA]

what happens if you switch portafilters? still the left side drips?