In this video, you can see,
When 2 BMRs in different hemispheres are such that, their leading spots have magnetic flux of the opposite sign, then their flux gets cancelled over the equator. While, the flux of the trailing sunspots is carried to the poles by the meridional flow.
But when the tilt of the BMRs is such that the leading spots have magnetic flux of the same sign, there is no cancellation over the equator, and both the poles end up getting the same polarity of magnetic field.
When 2 BMRs in different hemispheres are such that, their leading spots have magnetic flux of the opposite sign, then their flux gets cancelled over the equator. While, the flux of the trailing sunspots is carried to the poles by the meridional flow.
But when the tilt of the BMRs is such that the leading spots have magnetic flux of the same sign, there is no cancellation over the equator, and both the poles end up getting the same polarity of magnetic field.
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