One of two issues to check:
1. The factory sometimes misses installing block off's and drip diverts or installs them incorrectly.
Check these area's first. See attachment for locations to check.
In particular, this purple panel in the document CAN be mounted on the outside of the L bracket instead of inside per design. This will allow water to leak outside the cabinet.
2. Check RPM/ static issues.
Coil Face velocity could be an issue in which you would reduce the airflow to solve the water carry over issues.