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The cause of this is simple - you have added multiple "start date" fields.
There are two places you will need to check this.
Admin -> Issues -> Custom fields -> type "start" into the search, and it will list all the fields with "start" in their name.
Check each Team-managed project's fields. Fields added to TMPs by their project admins are localised to the project, and with a common field use like "start date", it's likely people will end up adding them to a lot of projects.
When you've found out where the fields are coming from, I would recommend doing some housekeeping and training.
The easy option is to talk to all the team-managed projects and tell them to rename their start date field with a standard (my usual recommendation is to use the project key to make it easy to identify in the list - ABC Start Date, DEF Start Date)
But there is a much better option, which will hugely improve your reporting and search - consolidate down into a single field. You can do this by creating a new start date field in the global list, although if you already have one or more, then choose and reuse one of them. I'll call this the "target start date"
- Make sure the target start date field is global - it has a "context" that says "global", and it's not locked to any projects or issue types
- Now, the painful bit - you will need to look at every other "start date" field that you want to remove, looking for
- Where it appears
- Any screens in company-managed projects
- Every team-managed project's layouts
- Add the target start date everywhere you find it is used in screens and team-managed projects
- For any issue that has a start date filled, you will want to script or automate something that will copy the current data into the target start date
- Once all the data is copied, delete the "rogue" start date field!
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