ROSWTF "unexpectedly connected" message and creation of new nodes

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I am attempting multi-robot simulation (currently involving two robots) and the problem is with the roswtf which throws "WARNING The following nodes are unexpectedly connected:" warning as mentioned in this terse and beautiful question (But the answer is not satisfactory). But, in my case, roswtf is also creating /tf topics and creating new nodes like /roswtf_11591_1480848778816 and /roswtf_11751_1480848797413 each time I run roswtf.

The rqt_graph s are as shown.

and

Can somebody be requested to let me know why this is happening and the reason behind it? Thanks for your time and consideration.

Reference note: The entire log can be found here.