I haven't heard of any pile-ups from other site browsers on that area of chrome 12 (or any area of 12). I do have a lot of matches a bit later on 12, from about 27 to 44, that are only a bit over 8 cms.
It would be interesting to hear if anyone else is having chrome 12 pile-ups via sites with chrome browsers. I put the wonky segments into my Genome Mate also, but I do see "pile-ups" in other areas sometimes beyond those identified about 6 months ago..