Steam escapes from pressure cooker

I have used my pressure cooker twice now and it never seems to get up to temperature because quite a bit of steam escapes during the cooking process. In fact, when the food should be done after the recommended time, I never have to release any steam/pressure .Is it normal for steam to escape while cooking and if so...how much is normal? It appears as though something is not right with the lid or gasket?

Thanks !