Pin 13 HIGH Problem

Hello, I have the following Problem: on Pin 13 I only get 3.3 Volts on HIGH output, on all other pins i get 4.4 Volts. Someone knows the problem? What can I do to get there 4.4 V although?

I have a 12 V Input on my USB-Board

Thanks a lot for your help!!

amoc

The pin 13 have a resistor