Google contacts custom labels given _1 suffix


I’ve noticed that all my existing contacts that had custom labels for emails and phone numbers, have had an _1 appended to them, when viewed at in the browser.

All custom labels (Helpline, Switchboard) become Helpline_1, Switchboard_1, etc.
Non-custom labels (Work, Home, Mobile, etc.) labels are unmodified.

When viewing contacts in the eM Client, there’s no _1 showing.

Is this expected? Can it be fixed?