There are a large number of varieties in Bureau precancels - Horace Q. Trout's catalogue "Specialists' Guide to Bureau Print Precancels" runs to over 750 pages. There is no listing like yours that shows the break in the top line, however. Here's a sample listing from the catalogue.

For the Kingston, NY precancel, that one used a metal electrotype device, and the forces required to bend the plate into that shape would be tremendous. It's almost certainly an example of the sheet slipping during the precancel printing process.
Ryan