Hi Angela,
The only situation where visits can be increase without increasing the page views is if you have s.tl() calls implemented. Below is the documentation for the same.
The s.tl() Function - Link Tracking
On a page load if s.t() call is implemented then Page view will fire along with increment of visit.
However, due to any reason if only s.tl() is implemented then pageview will not increment only visit will increment.
regards
karandeep Singh