Equations in image format
The common issue across all files is that the equations are in Image format. so that xsweet doesn't recognise them as equations instead recognises them as images.
Currently xsweet converts equations only if the following format is in the document.
But in the case of the sample files xsweet is unable to recognise the equations if it is in image format as in the below attached image.
Please find the attached manuscript for the same as well27353-Manuscript-196158-1-2-20221026.docx