Contents of Repeater fields are not saved

[Hergé]

When I add certain fields to a repeater, enter text into them and save the page, the field goes blank.

This does not happen if I edit the page under Admin -> Repeaters -> repeater_name -> parent_page_name. Then when I edit it on the parent page, they either go blank or revert to the values I entered when editing the page directly.

It doesn't seem to matter what type the fields are. Some TextLanguage fields are saved, others with identical settings are not.

ProcessWire version: 3.0.42

[BitPoet]

Another strange Apache+mod_security issue perhaps?

[Hergé]

mod_security isn't installed locally and doesn't appear to be installed on the remote server either.

I looked into it again and realized I missed one setting: autojoin. With that unchecked, the changes are saved.