Well, coming from experience with 100% new aussie scooba 385 from harvey norman, my scooba picks up the most water from tiles if theres not much grout - eg large tiles. In the bathrooms i have very small tiles which result in alot more grout lines and it leaves the floor wetter.
@iMayne the vac port is for floor prep. If that were true the scooba would leave every drop whilst moving forward since the laying down of water happens right before the cleaning heads straight brush.
The space between the squeegees which OP photographed is where the water pick up happens, and from the looks of it, if you manage to flatten out the curved squeegee or even better, buy a new cleaning head, should be problem solved.