Which schematic in the datasheet? What is the open circuit voltage and short circuit current for your solar panel? What is the VBAT_OV per your resistors? Keep in mind the following:
If VIN_DC is higher than VSTOR and VSTOR is higher than VBAT_OV, the input
VIN_DC is pulled to ground through a small resistance to stop further charging of the
attached battery or capacitor. It is critical that if this case is expected, the impedance of
the source attached to VIN_DC be higher than 20Ω and not a low impedance source.