The data in the TDC is pointed by entering a range and bearing (point periscope at it) and and sending it to the TDC. The green line should not be on the target but somewhere in front of it, wherever the torpedo will collide with it as the target moves forward. Which may incidentally be where that escort is now. If you don't give it a new range and bearing it will just keep the last setting whatever it may have been before.
By "TDC off" you mean that red button light on the interface? That is really the position keeper, a calculator which progresses the position of the target based on the range and bearing you entered last. (Also that white marker) So if it is off it will not change that position relative to yours. Could you post screenshots of the attack map and TDC/PK displays to give a better analysis of what went wrong?
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