I suspect you built the ppcmem curses UI but not the web interface?
For the web interface, the Ocaml code gets compiled into a system.js file but the ppcmem-tarball.tar.gz I downloaded was still missing a few other required Javascript files. (the Makefile rule for taring up the project missed a few)
Luckily the files missing from the source tarball are readily available from the web site so I was able to build and run that pretty point and click web interface locally in the end :)