Marshall Islands "export" ships (they're also the biggest import), so it's likely inflated like the Singapore's numbers. They have the third largest ship registry in the world.
Looking it up, their main exports are cotton and aluminium, so I would guess it relates to equipment/industrial manufacturing, as well as clothing in Switzerland.
Both Antigua and Tajikistan are tiny countries with tiny economies that export very little. If either country had even a single business or industry that struck up some kind of deal with the much larger, more resource-hungry economies of the UAE or Switzerland, then whatever they exported to those countries as part of that deal would then overshadow the piddly amounts they exported anywhere else. That's my best guess.
Just checked (cause I'm normal), and the only mutual pair here is United States-Canada. Nothing else makes a loop, and every other country eventually feeds into that mutual pair (and all but Cuba feed into the United States).
Ivory Coast probably exporting loads of coffee to the Netherlands...
I missed
Iraq Syria
Latvia Lithuania
Croatia Slovenia
Kosovo Albania
Ethiopia Somalia
Senegal Mali
Cyprus Lebanon
Togo Burkina Faso
Dominica St. Kitts & Nevis