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Check a couple of things:

Is the time on both the PCs synchronised?
rosrun tf tf_echo /map /base_footprint (and print the output of this)

Check a couple of things:

Is the time on both the PCs synchronised? It's possible that the time is different across both your machines. In which case, you can set up an NTP server on one of them to synchronise time.
Use the following commands to debug

rosrun tf view_frames

rosrun tf tf_echo /map ~~/base_footprint~~ /base_footprint

(and ~~print~~ show us the output of ~~this)~~that if you aren't able to figure it out)

Also, there should be a few other related questions on this website since this is a common error and the tf tutorials has help on common pitfalls.

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