If u look carefully, the carthies often ship troops to and from Iberia. It's all done in a single turn tho, so it's hard to spot unless there's a specific FM tagging along. The opposite happens when The Luso (a lot rarer) takes Mastia/Tolosa. They try to grab Carthie island holdings, then (futile attempts at) africa. Similar things happen to the Epiros(Pyrrhos goes back for another go), KH (island hopping) and Ptolemaios (Cyprus).