It happens in the google chrome version 76（76.0.3809.100 later) .
The issue is already known and the cause is auto-update of google chrome browser which changed rendering behavior in the latest version.
We officially announced an emergency patch for the issue.
The patch is for Intra-mart Accel Platform 2015 Winter (Lydia) [8.0.12] or later.
Kindly download from the following URL, import to your IM-Juggling, and re-deploy a war file.
If you are using earlier version than Intra-mart Accel Platform 2015 Winter, or you may need any other workaround,
please contact us with our support helpdesk or sales.
Thank you for your understanding.