Missing ship sinking confirmation (resulting in tonnage loss) in captain's logs

[Paul Riley]

From my last patrol report you will see that I sunk 3 ships (1 Granville,1 Med Cargo,1 Small Merch) for a total of 11.961 tonnes,and a renown score of 347.80.I know this because on my way back after the patrol ended I checked my patrol log (button k) to check the sinkings logs and record my tonnage on paper.However,when I got back to port I looked in the captain's logs and the game confirmed only 2 sinkings for a total of 10.124 tonnes and a renown score of 282.00 , a loss of 1.837 tonnes and 65.8 renown.
This is not a major loss but I would still like the game to account for the 3 sinkings instead of 2.In my experience this is the first time I have encountered this behaviour.
Any ideas what went wrong here and how I can edit the game (via patrol editor?) to correctly display the 3 sinkings? If this can't be done then at least I have all my patrol notes on paper confirming my kills.

Thanks.