incorrect spelling keeps appearing even after I've corrected everything

When I correct a whole document I still get incorrect spelling (red squiggly lines) every time I come to open the same document again. Can anyone help? Thanks.

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Is your spell-corrected document being saved to disc afterwards?

The location might be write protected, the document might be write protected, or the operating system/anti virus might be preventing LibreOffice writing to disc

Thank you for that I will check all of those things.