Export and comparative advantage

I quote Ricardo from Wikipedia here: "if two countries capable of producing two commodities engage in the free market, then each country will increase its overall consumption by exporting the good for which it has a comparative advantage while importing the other good, provided that there exist differences in labor productivity between both countries"

I have found in many cases when countries export and import the same good. Why so much ado about nothing ? If you have a good then why export it and then import it ? Is this a case of difference in quality of goods ? Or a case of inter-temporal pricing and arbitrage seeking behavior of manufacturers ?

Consider an example of banana here. (Screenshot attached). Belgium-Luxembourg both imports and exports bananas. Why ? I have seen similar behavior of countries for iron ore, etc. as well. Just confuses me. Can someone throw some light ? Thanks in advance.

Link: (html)https://atlas.media.mit.edu/en/profile/hs/0803/(h…

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