See, this is why it's lose-lose for the federal government. If they allow states to bid against each other for the same equipment, enriching shady middlemen and stockpilers, this is proof they've failed (see comment elsewhere in thread) - but if they seize those stockpiles and don't allow them to be sold at a massive markup to the highest bidder, they're actively intercepting medical supplies that states purchase to save their populations from dying. The American press has been loudly pushing both of these narratives at once.
Probably because the president (still the leader of said government) telling the press that his people shouldn't talk to governors which haven't been nice enough to him doesn't inspire confidence that the second part is done in the best interest of all states. Now, if the federal government would show that they don't just do it for selfish purposes that narrative would die down pretty fast.
The lack of coordination and mixed messages have been a problem. Trump has publicly said governors should be fending for themselves, and has also been "punishing" states with governors he doesn't like by not taking their calls. States have no reason to trust the federal government to properly help them, and the federal government has shown no capacity or willingness to do anything but release funds.