The BIAB styles will override any settings you make unless you set those special checks. The easiest thing to do is to make those checks and, in addition, check the 'Save Mixer settings with each song...' - also found on the same screen (ALT F2). With these checked, every time you save the file with Ctrl S, those settings will apply.

Does the problem occur with every song or just one? You may try a Factory Reset.

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