texture does not change much and some jams look runnier than others. . .
If you followed the instructions, the hot jam/jelly will be liquid when pouring into jars. It does jell upon cooling; usually I see jell on the sides of the pan and on my stir-stick after jarring.
With the stuff in the packages, one is always told that instructions must be followed or you may not get jell. Think of boxed/packaged pectin as "foolproof" as long as the "fool" can follow instructions, versus the old-school way of merely combining fruit with sugar and cooking to the jell point, which requires a little more expertise. Every year I judge 4H kids that have no problem at all with packaged pectin jams.
Sometimes when I make jam from boxed pectin mix it comes out more firm than I like (Like you Barbara), so the next batch gets extra fruit or juice to make a softer set.
If you followed instructions, it should be just fine.