There is a bug indeed with switching between torpedo tubes with different speed torpedoes. (T1 slow, medium, fast, T2). When you select a different tube with a torpedo going at a different speed than the torpedo calculations were based on before, they are not updated. Be mindful to (re-)set the speed switch before aiming whenever to switch tubes. Or never use different speeds all together, use the common speed.
It could also be that you forgot to set the TDC update setting to on. Then it keeps firing the torpedo to a constant angle. (which could happen to be 000)
Edit: If the torpedoes are fired along the line of periscope sight then the speed is set to 0 kts or AOB is set to 0 or 180.
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