Doug, again NOT being there I cant say for sure but here's at least ONE possibility based on my years of experience in the engineering field.
You may have what are referred to in the trade as MULTI WIRE BRANCH CIRCUITS
An example is say a Duplex receptacle (NEMA 5-15R or 5-20R) where the top to bottom tie bar on the HOT sided of the duplex receptacle is broke off such that the TOP receptacle is on Leg A (perhaps Black) while the BOTTOM receptacle is in Leg B (perhaps Red) (AND ITS 240 VOLTS L1 TO L2) HOWEVER the tie bar on the Neutral remains so only one common Neutral (white) serves BOTH top and bottom circuits.
Why were they used you ask ????
That way you could have say a 12 amp toaster on the top and a 12 amp microwave on the bottom (24 amp load) BUT IF IT WAS A REGULAR RECEPTACLE (NOT Multi Wire) 24 amps would trip a 15 or 20 amp breaker.
ALSO you save wire and money as ONLY ONE Neutral sufficed for two circuits...……. Two Hots, One Neutral
NOTE In my opinion and the way I practiced what I consider to be sound engineering I NEVER LIKED MULTI WIRE BRANCH CIRCUIT USE IN RESIDANTIAL APPLICATIONS even if perfectly NEC proper, because it was 240 VAC L1 to L2 and besides Billy Bob and Bubba had no clue what was going on and may not be aware that if only one breaker was open the other still had live 120 VAC present !!!!!
Obviously such a circuit required a two pole breaker so if one side was off the other was also and I preferred true two pole versus wire tied
DISCLAIMER I cant say for sure what you have and this is ONLY ONE POSSIBILITY no warranty Im right since its been YEARS since I practiced electrical power distribution design. Others may have more to add to this or other answers to your question this is ONLY ONE POSSIBILITY......
Where fire and life safety is concerned consider consulting trained competent current practicing electricians and electrical engineers versus lay opinions, the life you save may be yours or your family
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