be forwarned - the film was never completed, but released anyway
Obviously they never completed this film and cobbled together whatever footage was available into a semblance of a movie.
They were going to film the movie twice - once in a foreign language and once with the actors actually speaking English. Neither version was completed, so they pieced together what they had and released it anyway. Probably because they ran out of funds and felt they had no other option.
The first and last parts of the film are in a foreign language with on screen English subtitles. There is a section in the middle where the actors are actually speaking English (not dubbed, but speaking English live as filmed). Either neither version was completed, or perhaps they decided to piece together one version as a cost cutting compromise?
I can deal with the patchwork assembly, but unfortunately it doesn't appear the film as released was complete. It was creepy, with lots of strange things happening, but in the end no explanation is ever given.