Here is the URL for it.  Everybody can edit.

ha ha, the embedded version also gets that shape.

Hi Yasushi,

Thank you for reporting this issue and sharing the board with us! 

I’m afraid that currently, there is a bug on our end that is causing this issue with exporting callouts to best quality PDF. We’re bringing our sincere apologies for the inconvenience! 

Please, be assured that our engineers will do their best to fix this issue as soon as they can.

Thank you for your patience!