someone may have tapped the 240 for another outlet like perhaps a lttle
used welder or other infrequent load. i must admit doing that.... being
out of breaker slots....
the 2 loads are never on at the same time...

theres also a chance someone doubled up the number of cables to save
buying heavier wire.

really need to know more....

likely not safe but if it feeds say a now unused 240 outlet for welding
and the conductors are heavy enough it wouldnt be a big thing