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You probably just used Duty 1 for the instrument somewhere which boosts the volume, or distorts the wave if maximum volume is reached. (Sawtooth max is more than 15 / F)
You may want to have a look at [url=http://www.famitracker.com/wiki/index.php?title=Effect_Vxx#Sawtooth_usage_notes]this, specifically the last paragraph. That is very likely to be your issue here.
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