about COR feature 2

We use the TPS65930 in our product.

I would like to know about how to use a COR feature. （TRM　4.4.2.1 COR Feature）
We are using the COR function in the keypad.
　KEYP_SIH_CTRL (setting 0x06)

Interruption is cleared after reading KEYP_ISR1 twice at the time of interruption generating.
(At once, it is not cleared. )

Isn't it cleared if ISR1 is not read twice?