Did the plug look like this?
5765-bk.jpg
If so it's not foreign it's a NEMA 5-20r plug as the machine draws more than 15 amps. Still 120v which is why it's probably working. The original cord should be installed and the wall receptacle changed to accommodate as long as the breaker is rated for 20 amps.
As for the jams you should definitely print a 22-6 (Sim 22-6 then execute) and get a list of jam codes which should help pinpoint the issue as was previously mentioned. Does the page have any creases or ridges indicating something blocking its path?
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