Playing as French, F&IW, 1.04c plus community mod.
Have had the Flotille de L'Isle Royale sat in Louisbourg harbour in passive posture for nearly a year. It's strength has been 149/200 for all that time, it hasn't received any replacements. My total supply usage for all units in Cap Breton is 69 a go and Louisbourg has a supply level of 32, thats about 150 supply a turn, so there has been enough supply and I haven't been besieged or blockaded at all.
Why hasn't the fleet's strength gone up?

The manual doesn't say anything about level of harbour required to receive replacements, just says a harbour, although the one in question is only level 1 so rate of repair will be slower than better harbours.
Saves and logs attached