Weird double format

[jackald]

Before format:

After format:

If I do one undo:

I can not work out why this is happening, It seems like it is formatting the text twice. To get back to the original text I have to undo twice to get to the original text. After the first undo the text looks correctly formatted.

[pascalre]

@jackald please provide your custom settings and the document before sorting as text