Appointments Plugin Errors (corrupt or bug?)

My customer is using this plugin and for months we've had no problems with it and really pleased with what you've created.

After the most recent update, however, we're seeing a strange bug.

1) There is only one service provider 'jaylane' (confirmed)
2) Appointments all display the wrong name 'shyanne reznick' which is actually a client name.
3) When adding a new appointment - service provider dropdown displays Shyanne and not jaylane
4) This morning she was confirming someone else's appointment and discovered Shyanne's name again showing up as that client record

Either something is corrupt (which I cannot confirm or see) or there is a bug.

Has anyone else encountered anything similar? Can I get help to troubleshoot this, please?

Thanks, Lee