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Just re-read your first post @Woodpecker UK Ltd 

...and the column which has now appeared on QBO that was previously not there is "Service Date". 

Again, an extra column on the input screen shouldn't affect the print output but to get rid of the Service Date column on the screen (assuming you aren't using it of course), open an invoice input/edit screen, go to the settings cog icon & this screen will pop out...

The Optional Columns > Date is the Service Date column.

Hope this helps.