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What is there to explain?  Every country has its own governance and policies.  The US has reasons not to ratify UNCLOS.  How can we blame the US for not ratifying UNCLOS when there is a dispute among UNCLOS members?

I am just conjecting why the US did not ratify UNCLOS and China did. UNCLOS was drafted during the COLD WAR. The US was afraid to lose the remote islands like Hawaii and Guam if they ratified UNCLOS.

The United States did not ratify UNCLOS because of fears among conservative Republicans that it would undermine U.S. sovereignty by transferring “ownership” of the high seas to the United Nations.

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.cfr.org/blog/international-treaties-united-states-refuses-play-ball&ved=2ahUKEwiG4pv4n4-HAxWF1zgGHYMtAwAQFnoECA4QAw&usg=AOvVaw0if4KpbPv3tKzkX0C_Jyi5

As to why China ratified UNCLOS when they also have remote islands, is not known.