Centre text

Working in LibreOffice Writer, on a page over 100cm wide, (To print a banner.) centring text goes haywire. Some lines centre, but others do not. I have tried different page widths and different font sizes, and between the different tests, the centring is inconsistant. Is this a known bug on wider pages, or am I doing something wrong

Looks it works up to ~62 cm, but in theory there is a limit of 300x300 Does Libre Writer have a maximum page size limit?

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