Mountain Blood can become solid due to the water content being very low and if the lid is left off, even more moisture can leave the jar, causing it to be quite hard and difficult to remove.
Brands that are softer simply have more water content in there.
Sometimes it can be a little too solid, so the best thing to do is pop a couple of drops of filtered water (literally drops) into the jar, close the lid and leave overnight. The water will help the shilajit to soften and it will be much easier to get out of the jar.