Have you experienced that any user didn't change anything, but the Planned start date for GANTT was changed.

[Sangjun Jeon]

Have you experienced that any user didn't change anything, but the Planned start date for GANTT was changed automatically. This problem happens once a week, two weeks or a month.

It is strange that the number of days is changed only but not month and years.

As well as when creating issue without inputting the planned start date of GANTT, 

The issue is immediately resolved and the dates of planned end and planned start of GANTT are set with some day.

It seems that the problem should be the GANTT field... but how to make sure that's problem... hm...

Where should i check first from? I can't find any cause about when and how this problem happens.

I have totally no idea.

Please help.

[Sangjun Jeon]

Ah... you're right. hm... Anyway thank you so much for your comment.

[Vasiliy Zverev]

Do you use some plugin for Gant? Maybe it is bug of plugin, not for JIRA