AI sub experience!

[HanSolo78]

I tried the AI subs today in a self created single mission and experienced quite weird things.

1.
The sub was reported by my hydrophone station in about 6000 meters, but there was no sub there... I created it surfaced but there was nothing.
Then suddenly it appeared about 2000m in front of the german merchant!!


2.
For me it seems that the AI torpedoes do not work properly... the sub starts the attack surfaced at about 2000m, fires about 6-8 torpedoes and dives away.
But unfortunately all torpedoes sink to bottom without any propeller propulsion:



Another experience I made in another single mission where I let a german type VIIb&VIIc approach a british merchant.
Another weird behaviour; because when the AI subs got contact of the british merchant, they simply dove and made a turn around with heading in the opposite direction.

Did you make different or similar experiences?