Dark Waters glitch, one propeller working?

[mazzi]

Originally Posted by 1Patriotofmany

Any suggestions or knowledge what's going on there?

When charging the battery, one engine runs on the propeller, the second engine works to charge the battery - this means the second screw does not spin. As soon as the battery charge reaches 100%, the second screw starts turning, this is such a feature of the game.
You can turn off battery charging without waiting for 100% using a button in the interface HUD - the second screw should immediately start spinning.