The game is acting normally. From the date you gave you are probably in a Porpoise Class. Here are the end dates for the submarines in the Freemantle flotilla from the flotilla.upc file.
Porpoise
AvailabilityInterval= NULL, 1942-08-30
IDFlotillaLinkTransferTo= PearlHarborCommand
Salmon
AvailabilityInterval= NULL, 1943-08-01
IDFlotillaLinkTransferTo= PearlHarborCommand
Sargo
AvailabilityInterval= NULL, 1943-08-01
IDFlotillaLinkTransferTo= PearlHarborCommand
Tambor
AvailabilityInterval= 1942-06-12, 1944-01-01
IDFlotillaLinkTransferTo= PearlHarborCommand
Gar
AvailabilityInterval= 1942-06-09, 1943-09-15
IDFlotillaLinkTransferTo= PearlHarborCommand
Gato
AvailabilityInterval= 1942-12-01, NULL
IDFlotillaLinkTransferTo= NULL
Balao
AvailabilityInterval= 1943-07-23, NULL
IDFlotillaLinkTransferTo= NULL
S-18
AvailabilityInterval= NULL, 1942-04-17
IDFlotillaLinkTransferTo= BrisbaneCommand
Tips for staying in Fremantle where the targets are plentiful and the escorts rare. Upgrade a Porpoise before 3-1-42 and do not accept a further upgrade until after 12-1-1942. If you upgrade from 3-1-1942 to 12-1-1942 you will get a Gato but you will switch to Pearl.
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