react native secureTextEntry not working on android

I am trying to use react-native secureTextEntry to hide my password and confirm password fields during registration.I'm using custom InputBox component for textInput.below is my code,

                <InputBox 
                error={this.state.PwordError} 
                keyboardType={'default'} 
                onChangeText={Pword =>
                    this.setState({
                        Pword
                    })
                } 
                secureTextEntry={true}
                value={this.state.Pword} 
                pHolder={"Password"} 
                color={'white'} />
            <View style={styles.spacer} />
            <InputBox 
                error={this.state.CPwordError} 
                keyboardType={'default'} 
                onChangeText={CPword =>
                    this.setState({
                        CPword
                    })
                } 
                secureTextEntry={true}
                value={this.state.CPword} 
                pHolder={"Confirm Password"} 
                color={'white'} />

The first textbox works fine when a password is entered it show as dots, but the confirm password field does not work. does anyone have an idea why this could occur?

This is the input box that is referred by the above code

            <TextInput 
                    underlineColorAndroid="transparent"
                    placeholder={this.props.pHolder} 
                    placeholderTextColor={this.props.color === 'white' ? 'black':"white" } 
                    {...this.props}
                    style={this.props.color == 'white' ? styles.ReginputStyle : styles.inputStyle} 

                    /> 

i am using,

"react": "16.5.0",
"react-native": "0.57.1",

I was able to fix this by removing the keyboardType={'default'} code from my input component. Even though the problem is fixed i would like to know why the first secureTextEntry box worked while the other didn't, as both of them were identical except for the value. can any one give a reason to why this could occur,

thanks.

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