Relating to this question, I've managed to pinpoint a command, which when used with
XePersian, would produce a distorted itemize environment (in which, the triangles would be placed far to the right).
The command is:
When this code is active, the result in the output would look like this:
The output, with this code being deactivated, would produce:
Which is alright, but to the cost of losing all the useful information at the bottom of each slide (and sub/section titles at the top of each slide, which I guess is very much related to the theme being used).