The image submissions in my survey are listed as attachments, with no association to the questions they were submitted in.
Image attachments use keyword properties to associate an image to the question it was submitted against. Keyword properties are not supported by ArcGIS Enterprise prior to 10.8.1, so an image submitted to a survey published in an ArcGIS Enterprise portal prior to 10.8.1 will not be associated to a question. Similarly, images attached to a feature through a method other than a survey (for example, in ArcGIS Pro or an ArcGIS Online web map) may not have keywords. To learn how to automate the workflow for updating attachment keywords, see Update attachment keywords.
This can happen if your template uses a font that isn't recognized by the PDF report engine. You can fix this by embedding your required fonts into your DOCX report template.