Undefined appearing in maps references

In some boxes the numbering for map references includes the word "undefined", e.g., "3undefinedH-a".

It's happening in quite few places, but I cannot see anything wrong.

This is happening in a public read-only map of mine, Brexit, if you want to look at it.

Regards,

Roger

Hi Roger,

could you share the link to the map with me? I can not find it in your public maps.

Regards,

Rob

Thanks Roger, bug confirmed, I will keep you posted.

Regards,

Rob

Rob,

Here it is:

https://www.rationaleonline.com/map/t963hn/brexit/

Roger

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