Twilio Voice Timeout works differently on different confirmation nodes

I have configured bot with twilio voice channel. I have setup timeout there to 60sec and retries number to 10.

Now, my bot has several confirmation nodes. Some of them are really taking 60 sec to throw timeout message and do it 10 times. But for some, bot keeps saying timeout every 10 sec up to 3 times then terminates the call. I believe this is bug.