That's worded vaguely that makes it hard to see. GOD made the first pair of tablets, Moses made the second pair. GOD wrote the 10 commandments on both.
At that time the LORD said unto me, Hew thee two tables of stone like unto the first, and come up unto me into the mount, and make thee an ark of wood. And I will write on the tables the words that were in the first tables which thou brakest, and thou shalt put them in the ark. Deuteronomy 10:1-2
This showed me something I haven't seen before. The first pair of tablets were exposed for everyone to see, but the second pair were hidden in the ark, which symbolizes Christ. This signifies that righteousness would not come through law, but through Christ who would have to die.
This same sort of thing happened when GOD told Israel the first time to enter the promised land. That was in the fall of the year (time of first-ripe grapes) when the festival of tabernacles would have occurred (the time of rest from yearly labors), and when Noah's ark rested. They would have entered their rest in Canaan from the south without having to cross the Jordan River, which symbolizes death. But they did not enter because of unbelief, and had to enter during Passover in the springtime through the Jordan River, which signified the death of Christ, our Passover.
I'm always struck with how GOD initially dealt with Israel as if they wouldn't sin, but afterwards responded with a different way that dealt with their sin.