</nowiki>
The output shows the source path, the line number (<code>11</code>), and a tolerance (<code>0</code>), which will be positive if the input coordinate is slightly outside any bounding box recorded in the <code>.synctex</code> file.
If <code>mtxrun</code> output looks accurate enough, then probably TeXShop is at fault; otherwise, report the issue to ConTeXt's mailing list.