W, v and j were still pretty novel letters at that point. j was typically used as a final form for i/j so you will see things like the roman numeral for 3 represented as iij. V tended to be used for U/V in capitals and u for u/v in lowercase. W was often not a letter that was part of a typefont and writing VV or vv was the only way to represent it in print. The sixteenth century was the point where u and i became the vowel forms and V and j became the consonant forms. Later Latin is inconsistent in its use of u/v and i/j, right down to dictionaries. I remember having difficulty with my pocket Latin dictionary in college because I would often forget that iam was listed as jam in it (and similar instances of an initial consonantal i).

Interesting to note also the use of ã as shorthand for an, i.e. "the reſidue is in hãd" -> "the residue is in hand"

The printer likely had a limited set of types[1] from which to construct the page. If a page was unusually W-heavy, they probably ran out of W blocks, and substituted VV.

Also, V was considered "just another shape for U" for a long time.

[1]: https://en.wikipedia.org/wiki/Sort_(typesetting)