Unexpected results using Gedmatch

[Nameuser]

After months of checking 23&Me for new matches off and on. The closest matches I had were two 2nd cousins. I'd uploaded to Gedmatch many months ago and hadn't really checked it again. They seemed to have even less matches for me.

 I gave Gedmatch another look and it came back with match results that seem (maybe I'm miss interpreting the data) far closer than I imagined possible (see image in link)... Kind of freaking out here. Is this saying what I think it's saying? What are the odds of this being a mistake? I shouldn't have relatives with this much DNA in common with me that I don't know.

Excluding the very top result (a duplicate/ mistake of mine),  the next 5: what would you classify their relationships to me as?


Thanks for the help,

[..claire..]

Hi

And welcome to RootsChat.

I've just put up results from 23andme to Gedmatch but I'm not enamoured with the site at all. Can't help much but have you used the DNApainter tool in the link that will give you an idea of what you may be looking at

https://dnapainter.com/tools/sharedcmv4

Claire

[Nanna52]

If you click on the kit number of a match you get their matches rather than yours.  Could this have happened?  To get a match between you and one other person you click on the A in their row.

If this is not so I have also read that there has been trouble with some odd imports.  If the matches are still there then take a deep breath before you panic. 

[Nameuser]

If you click on the kit number of a match you get their matches rather than yours.  Could this have happened?

Don't think so... (Attached)

Could some kind of transfer mistake account for this?

[Nanna52]

I don’t know a lot about gedmatch, I can only comment on the experience I had.  The mistake I had disappeared after a day or two.  Shame, it looked promising as I have a non parental event in my line. 
I know of a group who have an adopted father/grandfather so all members of the family tested.  Do these matches have the same contact person?
If they are still there after a couple of days then you may need to contact them to see if you can work out a link.

[melba_schmelba]

Those are likely links of an uncle or aunt to a niece or nephew, or a grandparent to a grandchild, half siblings, or double first cousins.

[RJ_Paton]

If you look at DNAPainter on the link supplied by Claire you will get results like 

53.62%
Half 2C 2C1R Half 1C2R 1C3R
24.23%
Half GG-Aunt / Uncle 2C Half 1C1R 1C2R Half GG-Niece / Nephew
16.34%
3C Half 2C1R 2C2R Half 1C3R
5.35%
2C3R † Half 3C 3C1R Half 2C2R
0.46%
3C2R † 4C † Half 3C1R

This was for the 151.9cM reading

[melba_schmelba]

If you look at DNAPainter on the link supplied by Claire you will get results like 

53.62%
Half 2C 2C1R Half 1C2R 1C3R
24.23%
Half GG-Aunt / Uncle 2C Half 1C1R 1C2R Half GG-Niece / Nephew
16.34%
3C Half 2C1R 2C2R Half 1C3R
5.35%
2C3R † Half 3C 3C1R Half 2C2R
0.46%
3C2R † 4C † Half 3C1R

This was for the 151.9cM reading

I think 151.9 was the largest segment, not the total cM shared, which was much larger.

[Janethepain]

When I transferred from the usual Gedmatch to Genesis, It brought up about a dozen bizarre matches which were an error.

You could identify them because, although they showed on the one-to-many list, some very high up my table ( 9 in the top 70), if you went further, and did a 1-to-1 match comparison, it told you you had 0 cM of common DNA.  I had to email gedmatch, and they resolved the problem!!