I can't see a problem Winchester. What is worrying you? Mind you, it's hard to believe that seven years have passed between the first photo and the other two. It doesn't seem to have grown at all.

Well. It looks like a Kilmarnock Willow that was butchered in the first pic. and has never recovered. The lump in the stem just below the bottom branch is a graft scar, typical of a Kilmarnock, but the branches should be hanging down towards the ground. I can only assume that any growing points on the branches were cut off when it was pruned as in the first picture and that it has never recovered, although I don't understand this.

Is the bark on the trunk intact, Winchester? It is acting suspiciously like a tree that has been girdled.