Android Question sending text via Bluetooth - B4Chat tutorial - interesting behavior

Dear friends,

I am playing with - Chat Bluetooth tutorial - and I have found, that here is
interesting behavor, for example if I send via bluetooth this text "HalloXYZ" the I received in Chat this:

You: H
You: alloXYZ

Click to expand...

(only sometimes I get complete text "HalloXYZ")
I Am using classic "HC" BT with 19200 baud rate

Have somebody similar behavior of bluetooth?
I think that the reason is bluetooth hardware.

When that issue is happen, then I can not recognize if word "Hallo" was received in string..
Thank you
Best regards
p4ppc