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KEAZ128 PTB4 output  unusual?

Question asked by 蔣 維哲 on May 9, 2019
Latest reply on May 16, 2019 by Jiri Kral

When I using J-LINK do step by step. PTB4 is correct output. Like LED3 in photo:

But,when I Stand alone by power supplier. PTB4 is strange. Like LED3 in photo:

PTB4 only supply 1.68V. Unlike other PIN supply 5V.

LED1~LED4 are same circuit design.The only difference is using  difference output pin in order PTC2,PTC3,PTB4,PTB5.

What difference between PTB4 with other?

Program like this:

Outcomes