Hi!
when we use the extra field type text area on one site, in the backend > k2 > item the changes in a text area are not saved anymore. It seems the editor (in our case JCE) is loaded twice, the debug console pints out 81 warnings (one for every editor button), e.g.:

DOM] Found 2 elements with non-unique id #K2ExtraField_27_abbr: (More info: goo.gl/9p2vKq)

<button type="button" id="K2ExtraField_27_abbr" class="mceButton mce_abbr mceButtonDisabled" title="Abbreviation" aria-label="Abbreviation" tabindex="-1" aria-disabled="true"><span role="presentation" class="mceIcon mce_abbr"></span></button>

<button type="button" id="K2ExtraField_27_abbr" class="mceButton mce_abbr mceButtonDisabled" title="Abbreviation" aria-label="Abbreviation" tabindex="-1" aria-disabled="true"><span role="presentation" class="mceIcon mce_abbr"></span></button>

Is there any solution to this?`
We mainly want just admins to be able to use line breaks.

thanks and best regards!
Jonathan

Dear Fotis,
thanks for your quick reply, I have looked through all the extra fields in all the groups - but there is no duplicated alias present.
Also changing the text field extra field alias doesn't resolve the problem.

The weird behaviour is:
when I use the switch editor ff button above the editor area, a second copy of the textfield extrafield appears without an editor and when switching the editor on again the copy stays but displays the editor too.
Screenshot attached.

best regards!