Why would the passenger foot well/floorboard fill with water when it rains.

What is your question?

This happens every time it rains. The windows are all the way up, the moon roof is closed, and there is no moisture on the seals of the windows, or moon roof. There is no sign of water running down inside of the window, door frame or on the seat. A repair shop cleared any old leaves next to and over the fender drain on passenger side by the windshield wiper, and cleared any possible blockage with a forced air hose. One person pulled up the carpet in the passenger foot well and felt for water leaking or dripping as another person held a water hose over the car at all angles. No water was coming in. But, the next time it rained, the passenger foot well filled with water again.

What makes this problem better or worse?

It happens every time it rains

How long has your 2010 Toyota Highlander had this problem?

Since I had work done on June 20, 2018, as far as I know.