6950 kHz and 6955 kHz USB and LSB respectively, causing QRM to each other.
Spanish language on 6950 USB (lots of salty sailor talk, or maybe just foul-mouthed radio operators [freebanders on 43 meters]), while at the same time Portuguese or Spanish (too weak to be 100% sure) is heard on 6955 kHz LSB. Might actually be two QSOs going at once on 6955 LSB. SSB bandwidth for both groups is wide enough to cause QRM even with the freeband CB like 5 kHz channel spacing.