Hi Tom,
Thanks for your interest in Syncfusion Products.
I have tested for this issue with Y axis range and was not able to reproduce this issue and the Y axis labels are drawn correctly. I have attached the sample used for testing this issue in this link below.
rel='nofollow' href="http://websamples.syncfusion.com/samples/Chart.Windows/F78263/Sample1.htm">http://websamples.syncfusion.com/samples/Chart. Windows/F78263/Sample1.htm
Could you please let me know if I am missing something? Also please let us know if you are using any other older version (instead of latest version 6.4.0.15). So that it would be more helpful for us to verify whether this is a known issue with that version and update you.
Please let us know if you have any other queries. Thanks for your patience.
Regards,
Manohari.R