strange behavior of v18 rail in I2C applicaiton

Hi Dialog,
During development of I2c peripherals of DA14681 custom board, we have HW & SW settings below:
1, we use two channel of I2C, 4.7K pull-up resistor for both SCL and SDA
2, we have HW interface settings in PXP project:
hw_gpio_set_pin_function(CFG_GPIO_I2C1_SCL_PORT,CFG_GPIO_I2C1_SCL_PIN,HW_GPIO_MODE_OUTPUT,HW_GPIO_FUNC_I2C_SCL);
hw_gpio_set_pin_function(CFG_GPIO_I2C1_SDA_PORT,CFG_GPIO_I2C1_SDA_PIN,HW_GPIO_MODE_INPUT,HW_GPIO_FUNC_I2C_SDA);

hw_gpio_set_pin_function(CFG_GPIO_I2C2_SCL_PORT,CFG_GPIO_I2C2_SCL_PIN,HW_GPIO_MODE_OUTPUT,HW_GPIO_FUNC_I2C2_SCL);
hw_gpio_set_pin_function(CFG_GPIO_I2C2_SDA_PORT,CFG_GPIO_I2C2_SDA_PIN,HW_GPIO_MODE_INPUT,HW_GPIO_FUNC_I2C2_SCL);

routines run correctly, we can found pxp signal, but V18 rail is about 3V, close to battery voltage ( we use CR2450 coin battery)
My question is, is there any impact to system for this abnormal voltage? Currently we have 2 I2C peripherals working in run mode. Current Consumption measured
is 1.5ma ( 16MHZ) in run mode and 17ua in sleep mode. It seems a little bit wierd for 1.5ma consumption because last time we have 600ua measured without peripherals.

Thanks.