Thank you PhilE
I have found my problem.
I have checked command "raspi-gpio get 0-15". I see that there is no problem like your result.
But when I run my program , the result of this command changed. 4,5 (Uart3) and 13 (Uart5) gpio pins "alt=4" properties are cleared and "func" properties are changed.
My program is runnig on mono c# platform.
I am using Unosquare library "https://github.com/unosquare/raspberryio
". That is perfect library for mono.
On my program I was enabled SPI. I noticed that when I was done it 4,5 and 13 pins properties changed.
Cancelled codes are below
Pi.Spi.Channel0Frequency = SpiChannel.MinFrequency;
So, I cancelled these SPI init codes and problem solved. Now all 5 uarts works without any problem.