From the 8k filing it seems there were only 11 million warrants exercised, which brought us a bit over 2 million dollars in cash. As it stands, per the terms of the tranche 2 warrants, at least 50% of the total warrants MUST be exercised or they will be forfeited.
I don't claim to be an expert here, but I have taken classes in finance with some exposure to warrants and how they operate, so I am going to go out on a limb and say that maybe the investors only chose to exercise that amount right now and possibly more later before they expire? Its confusing, at least until we hear more from the company.