Sometimes Linguix does not flag some words that seem to be written in the US style when the UK dialect is set up. This might be the issue when the spelling is not exactly a mistake in the UK English,
For example, take the word “summarise” — the ”s”-version is more common in British English. However, “summarize” can also be frequently found. Instead, in the US the “s”-version is so rarely used, that it would be considered a typo. The current logic is works like this.
Our policy here at Linguix is to show only mistakes with 100% rate.