Yup, it sounds like the CZ/VZ "gremlin". I've seen several people here and on the CZ forum that have had this issue. When their Century guns don't have the tabbed bolt carrier Which I don't believe any of them come with one.. Some of the Century guns do this, some don't. I recall another "fix". But the easiest way is to buy a tabbed bolt carrier or have yourself or someone else tab it.
http://www.ar15.com/forums/t_4_99/145592_Tabbed_bolt_carriers_and_the_vz58_gremlin.html
http://www.czfirearms.us/index.php?topic=26292.0
http://www.czfirearms.us/index.php?topic=38703.0
I know Czechpoint sells their guns with the tabbed carrier. It's a shame, that since this is a known issue (that doesn't happen to everyone) in the US, Canada, and elsewhere where the semi auto 58 is sold. That Century doesn't have it in their rifles to begin with. The select fire/full auto 58s don't have this issue.
https://www.google.com/search?q=vz+58+tabbed+bolt+carrier&client=firefox-a&hs=b5B&rls=org.mozilla:en-US:official&source=lnms&tbm=isch&sa=X&ei=DD8BU4jNG-TWyQHq_oAw&ved=0CAoQ_AUoAg&biw=1366&bih=640