Keep in mind that equanimity is most important for you. The type of sensation you feel doesnot matter.

Whenever a deep-rooted sankhara comes to the surface, it will produce a particular type of sensation, but don’t assume that every sensation you feel is because of a sankhara.

When you are meditating, it is true that most of the sensations are because of sankharas, but there are many other causes for sensations to arise.

Whatever the cause, if a sensation occurs and you don’t generate a new sankhara, the purpose is served: naturally the old accumulated stock will start to come up to the surface of the mind and be eradicated.