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Problem solved.
Some background might be handy. I have a QHY 16200A CFW7. I installed the filters in the positions numbered from 1 through 7. Ha was 1, Sii was 2, etc.
I use NINA and I (thought) I mapped the same filters to the same positions.
I didn't realise that NINA starts from zero not one. I mapped the filters starting from one (deleting the zero altogether). So each of my filters were one out. I now have Ha mapped to NINA position 0 not 1, Si to 1 not 2, etc, etc.
That is not the first time I have mucked up a zero with a one. I doubt it will be the last.
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