problem with frigates

my game has somehow deleated all my frigates from the deployment list but it still has them saved on the ship desighn please help

above the ship designs, there are 3 small buttons named “Cr”, “Fr” and “Fi”.

You can locate them on this picture

Clicking “Fr” toggles Frigates on and off. Same goes for Cruisers “Cr” and Fighters “Fi”. Hope it helps.