Footnote formatting issue

I set this document up months ago and I am just getting back to work on it but have encountered an issue that I cannot seem to resolve by reveiwing the online Adobe notes:

• Please refer to Screen Shot 01. I have found that the space between a footnote number at the bottom of a page - such as 17 -  and the point at which text forming part of the footnote - Ibid... - varied from footnote to footnote on other pages;
• I therefore went into the Footnote Options and confirmed that the paragraph style that should be used was correctly selected, please refer to Screen Shot 02;
• I then opened the Options for the Paragraph Style and set a tab as per Screen Shot 03; and,
• inserted a trial footnote, shown as 18.

Returning to Screen Shot 01, we see that the point at which text forming part of footnote 18 is located more than 0.25 inch to the right of number 18 (the 0.25 indent is shown by the light blue guideline).

How do I remedy this?

Thanks in advance!