At a glance, I'd say that happened when a fighter tried to dock for refit. What Arma-compatible strikecraft were you running when this happened, and what carrier(s)?
For strikecrafts: I deployed A LOT of Raphuses, a Basque, a Saber (all three from Starfighter Intrastellar Modification Program <SIMP>), a few Greatswords and a Phosphor (both from Plunderin Strikecraft)
Since strikecraft can land on anything with a fighter bay, I'm just going to list every ship on my fleet that has a fighter bay: 2 Audacious, a Vengeance (both from Iron Shell), a Storm (Diable Avionics), 2 D'Erlons, a Normandie (both from Dassault Mikoyan Egineering), 3 Herons, a Briliant, 2 Cetans (Caymon's Ship Pack), a Minuano, 3 Syrigmas (both from Symetrical Ship Pack) and 3 Formicas (Stopgap Measures)