Read Function is not correct

[iamnomadgg]

Thanks for great work.

I am working on Special Bluetooth Device. My work:
Write(data);
Read(data);
Write(data);
Read(data);

Write function is working successfully. But read function is too working. So Coming Data is for example "abcde"
I am seeing "abcdeabcdebcde" in textView.

How Can I fix this?