Software buyers rarely convert on the first visit. A product manager searches for a tool to track feature requests, opens a few tabs, signs up for a trial on one of them, forwards a link to a colleague and comes back a week later through a brand search. If your account reports only the first signup, Google treats the easiest signups as the ideal ones and keeps finding more people like them, whether or not they ever open the product again.
The form is not the finish line
In most SaaS funnels the real milestones sit inside your product and your CRM: an activated workspace, a second seat invited, a demo held with a decision maker, an opportunity created, a plan upgraded. None of these are visible to the ad platform by default. Until they are sent back as conversions with values, bidding runs on a guess, and the account can look healthy on paper while pipeline stays flat.
Category terms attract the wrong crowd
Short searches such as project management software or CRM pull in solo freelancers, students writing papers, people looking for jobs at software firms and existing users hunting for the login page. Each of those clicks is paid for in the same auction as a serious buyer. The work is to separate them early, with negative keywords, tighter match types and landing pages that speak to the company size and use case you actually sell to.