The column-width thing is a known ‘feature’.
When eaDocX inserts information into Word, it does so as HTML (which makes it much more efficient than adding it in bits & pieces).
Unfortunately, Word then tries to ‘help’, by messing-about with column widths. In the case of your long hyperlink, it does just what it would do if you typed a long string, with no spaces, into a narrow coumn – it expands the column.
We’ve tried to ‘fix’ the column widths, but Word knows better (!) and just overrides it when it thinks that’s what we really want.
Perhaps we should just accept that Word knows more about what we want than we do. 🙂