Honey changes with the flowers the bees visit and the season they visit them in. That is why two jars can taste and look quite different, and why that is a good sign.
Raw honey may thicken or crystallise over time. This is natural. Warm the jar gently in a bowl of warm water to loosen it, and avoid boiling water.
Check the label for where and when it was harvested. If a seller cannot tell you, ask why.