Alt field data no show/load

Been testing the UR Image Slider plugin and in the main it works reasonably well but I found that despite having information in slides in the “Slide Alt Text” field and on the Media source images themselves, none of that is being loaded in either the title or alt html fields so it never shows on any of the slides.

Worth noting that I have some characters that would likely need encoding (eg: brackets, amphersand, etc..) but can’t see any reason for them not loading. Also no setting to turn alt text on/off