Nuvoton 8051 ML51-SD1AE controller

[SANKETMODHE7028]

hello sir i got one issue. i worked on 8051series ML51SD1AE controller

Here is my task is to blink LED
I use 4 GPIO pin and 4 led are there.
in these case

first line high so LED on and then other 3 lines going to open drain mode.
. 2nd line high so LED on then 1st ,3rd,and 4th pin going to open drain mode.
3rd line high so LED on then first 2 and 4th pin going to open drain mode.
4th pin high so LED on then first 3 pin going to open drain mode .
this is 4 cases works fine but one issue is generated . if pin going to open drain mode at that time the voltage 0.5 to 0.7 varrying .
i also checked in push pull , pull down/up mode then also pin having something voltage are there. what i do to avoid these error ?

[SANKETMODHE7028]

hello sir i got one issue. i worked on 8051series ML51SD1AE controller

Here is my task is to blink LED I use 4 GPIO pin and 4 led are there. in these case

first line high so LED on and then other 3 lines going to open drain mode. . 2nd line high so LED on then 1st ,3rd,and 4th pin going to open drain mode. 3rd line high so LED on then first 2 and 4th pin going to open drain mode. 4th pin high so LED on then first 3 pin going to open drain mode . this is 4 cases works fine but one issue is generated . if pin going to open drain mode at that time the voltage 0.5 to 0.7 varrying . i also checked in push pull , pull down/up mode then also pin having something voltage are there. what i do to avoid these error ?

please cheack the diagram . for testing purpose i using four LED . because line are shorted .