Kristin,
That's a deficiency in the way the GEDmatch one-to-many utility displays results. You probably need to back out the really small segments. When you have a match like that, take a look at it in the one-to-one comparison utility (click on the blue 'A' on the same line as the match). Decide what threshold you want to use (probably at least 7cM and 700 SNPs), and enter those values into the input form where it says 'SNP count minimum threshold...' and 'Minimum segment cM size...'

John