OKEY I FİX!
My problem solution was as follows.
my microphone settings were as follows.
Built-in microphone setting: automatic
External microphone setup + 6dB
microphone input setting: Line (This was wrong)
All filters are off.
When I chose the microphone input setting as "microphone", it was using both its own microphone and an external microphone and saving it as a single audio file. I thought the only solution for this was the "Line" option of the microphone input setting. I met with Istanbul Fujifilm. it was that I chose the microphone input setting as "microphone" and turned off the built-in microphone from the built-in microphone setting. When I did this I used the external microphone and it didn't record the internal microphone. I tried this with both cameras I have. And I was able to get a very clean sound in both! I hope it's just your fault too.
Also, the most common mistake was using a three-line jack. The machine causes 95% of problems when using the three-line jack. We need to use two-line jacks! Dont use your phones mic.
And sorry my english bad. I'm translated whit google. I hope you could understand.