The actual problem is that the IXD2 originally has 8 external torpedoes. SH3 has a problem with that, as it is only designed to model up to 6 external torpedoes, meaning things get buggy if you have 7 or more externals.
The simple and obvious solution would be to set your externals to 6 torpedoes, and if you wish to retain 26 total, you can add those 2 torpedoes back into the internal slots.
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