What does Safek Brochos L’Hakel mean? Are we Mekel on saying Hashem’s name in vain and make the Bracha again? Or, are we Mekel to maybe eat without a Bracha and don’t make the Bracha?

This is indeed a big halachik dilemma among the Poskim. Concerning Brachot there is no point in being Mekel since you may be saying Hashem's name in vain. On the other hand, you can't be Mekel to the other side since you're eating without a Bracha, a sin equal to stealing from Hashem. The Poskim decided that it's better not to say Hashem's name in vain, and Hashem prefers one does not make the Bracha and say His name in vain, and He will not consider it stealing. That said, there are some Poskim that say Safek Brachot L'Hakel even against the opinion of the Shulchan Aruch. Rabbi Ro'i Margalit