What you're doing and what's happening: When writing some right-to-left characters (Farsi, Arabic, ...) after some left-to-right characters, the rtl text goes from the cursor position into the left, causing it to be mixed with the ltr text written before.

Steps to reproduce: Open a Windows Terminal window. write some english characters, like abcdef. Then write some Farsi/Arabic text, like:

  سلام

Notice that the Farsi text goes inside the english text.

Screenshot: