Hello! I enjoy using shell.polymake.org.
I just ran into an odd occurrence. I defined new polytope $p1 by listing its points, and then entered a print command for its facets. I got an incorrect list of 13 facets. Then, I repeated the definition of $p1, and the print command for the facets. This time I got a correct-looking list of 21 facets.
Attached is a text file showing the commands and the printout of facets. Thanks!