Each countries data is calculated from a different source.
Scotland, Wales and Northern Ireland all report their own data, which we collect. This data may not match the data supplied by the Department for Health and Social Care which supplies the UK data as a whole. This due to a different cut off point.
The Department for Health and Social Care produce a set of numbers each day for the United Kingdom that we display on the United Kingdom and England page. Each other countries pages show data direct from the corresponding country.
The data we display is not inaccurate, it's just more recent (and relevant) due to us choosing to display data from multiple official sources.