Custom Field showing Custom Field ID and not the value that was input

[Jennie Sheridan]

I have a custom field that is a multiple line text box. Recently, when a user inputs values in this field it saves it, and then displays the custom fields ID and not what was inputted into the field (i.e. it fills the field with "customfield_13891-val"). This seems to be a very new occurrence and not presenting consistently. Has anyone had any experience with something like this before? Or know why it is happening? 

We're using JIRA v6.4.14.

Thanks!

[Nic Brough -Adaptavist-]

What type of field is it?

[Jennie Sheridan]

It's a text field (single line), with no special configurations. 

[Nic Brough -Adaptavist-]

There is something breaking it.  What add-ons do you have, and have you got any custom javascript?

[Jennie Sheridan]

On this project, I'm not seeing anything in the workflow or custom fields that has any javascript. 

These are the add ons we have on our installation:

Atlassian Universal Plugin Manager Plugin

Custom Content for JIRA

Customer Satisfaction Survey for JIRA

JIRA Agile

JIRA Suite Utilities

JIRA Timesheet Reports and Gadgets Plugin

Support Tools Plugin

Adaptavist ScriptRunner for JIRA Standard Edition

Applinks Diagnostics Plugin

Atlassian JIRA - Plugins - Healthcheck Plugin

Atlassian REST API Browser

Automation Module

Bitbucket Importer Plugin for JIM

JIRA Automation Plugin

JIRA Automation SPI

JIRA Calendar Plugin

JIRA Charting Plugin

JIRA Drag and Drop Attachment Plugin

JIRA GitHub Issue Importer

JIRA iCalendar Plugin

JIRA Misc Custom Fields

JIRA Toolkit Plugin

Redmine Importers Plugin for JIM

Support Healthcheck Plugin

ToDo list custom field

Zephyr for JIRA

[Nic Brough -Adaptavist-]

Do you have any "Behaviours" defined in the ScriptRunner add-on?