"were granted citizenship within one year"
Citizenship or residence?  I don't recall wet foot/dry foot providing a shortcut to naturalization.

"how the "issue' fixed?"
Opened up diplomacy with Cuba and fixed the due process issue for removal, ie. got Cuba to accept removed Cubans.  I thought it was pretty clear and easy to understand the first time.  Problem: No removal because due process requires Cuba to accept removed Cubans and Cuba refused.  Fix: Obama's diplomacy attempted to normalize relations with Cuba.  Cuba now accepts removed Cubans.