I ran a GEDmatch multi-kit analysis and got this report for Matches with Kit Number: -

And putting a different kit in first position, I get this report for Matches with Kit Number: -

The strange thing I notice is on Chromosome 12, in the first report I get several matches that span as much as from 1,359,590 to 5,316,226 (about 12.3 cM).  In the second report, I get   from 1,517,192 to 3,941,530 (7.58692 cM) matching   .

It matches    from first report, so why doesn't    appear in the first report?  Is this a bug?