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2013 Mazda 3 i Hatchback
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It absolutely could be a poor installation job on the replacement windshield. It could be a gap in the urethane, or poor surface prep that has corroded and created a gap under the urethane. It also could be a clogged drain for the sunroof if you have a sunroof. Sunroof leaks can travel down the A-pillar and show up under the dash. The other common source is from a blocked cowl drain, those back up and overflow into the cabin behind the dash.

I'd try soaking down the cowl area with a hose (just a trickle) or with a jug of water and see if it leaks inside. If not, then try to pour water around the windshield, starting at the bottom and working your way up. Lastly, try pouring water around the sunroof, though this may take a while to start dripping as the water has a long way to travel.
 
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