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Since I see that you have decimal entries, this suggests that you have used "RDF" as a base ring for your polygon.

You may check if it is the case by calling P.base_ring()

There is a known bug in RDF that pops up when plotting:

Otherwise, if you just want to visualize your polygon your should be able to visualize it with the command ".plot()".

More details will be explained in the extended tutorial which will appear in version 8.3:

Under "Geometry", "A longer introduction... " (once version 8.3 is out):

http://doc.sagemath.org/html/en/thematic_tutorials/index.html