Just tried to do bioterrorism 15-20 times and every single time it said "your scientists have accidently poisoned your own food supply"

I lost half my population and half my income in a matter of 20 turns and literally every single time it said I accidently poisoned my own country, 15-20 times in a row doesn't seem correct, it seems like something is wrong because almost every other spy attack has been successful up to this point