Upvote:0
One theory that suggests the source of the miracles was from other the Holy Spirit is Dr. Cleon Skousen's "Intelligence Theory"(summarized here, transcript here), which he explained in a talk to a group of LDS missionaries.
It's not official LDS doctrine, but it is based primarily on LDS scripture. The gist of it is this:
There are apparently some arguments (which I have not yet read), and my quick summary probably doesn't do the theory justice, but it is one (I'm sure of many) theories that may be able to answer your question.