The windows on the front of the home are leaking at the perimeters due to incorrect flashing details at the windows by both the window installation and the stone detailing.
Removal of the stone reveals only a single layer of WRB (weather resistant barrier). Most stone manufacturers are recommending a double layer of grade D building paper. Moisture appears to be migrating in at the window perimeters and overwhelming the WRB and penetrating the OSB behind it. The potential for microbial action is very high.
MBR window: the moisture is elevated in the exterior sheathing at this window.
This extends into the floor assembly below.
This is the floor system below the MBR window. The moisture has intruded to the plate line at the top of the foundation.