Couple of civs have ship styles defaulted to pirate - anyway I can get them back to normal default?

Hi all,

A couple of my custom civs have had their fleets defaulted to pirate style which means I cannot access some of their classes of ships (colony, constructor etc...). Is there any way I can get the fleets to return to a normal fleet default so I can add the proper ships to make them playable again?

Thanks in advance,

B