There are several reasons for honey to separate. It also may happen with high-quality natural honey. If you are completely sure that you bought not adulterated, but natural honey, then there is no reason for you to worry. This is a natural process, when at high temperature (usually above 20 degrees) honey separates into glucose and fructose. Honey does not lose its qualities and is ideal for consumption. Nevertheless, adulterated honey can also separate. Invert sugars, which often form the basis of adulterated honey, remain in a liquid viscous state for a long time. However, sooner or later such product divides into its component parts. Unscrupulous manufacturers add starch, molasses, chalk, flour, sugar to natural honey.
All these impurities by all means affect the aspect of the product in the form of separation, turbidity, foam and other defects.