This is happening to us in the CC2018 13.1 version.
I only saw one earlier example mentioned in the Forums (with CC2014).
Whenever a chunk of text, or text box is pasted into a fresh document, the language is Arabic. [Basic Paragraph] and all other styles have been set to English USA, and even though I do a find format/change format in the offending document, it still pastes as Arabic.
Exporting to .IDML, and reimporting did not solve.
Having the same problem described by rickburress. totally slowing me down.
Adobe please can we have a fix?
For all the wonderful things your software can do this is so annoying.
I am having the sam problem (in Dutch). It is not a preferences problem. It is indeed a glitch. I copy the Dutch text form a text box (Language: Dutch) and align left to another text box with the same spec's and the copied text suddenly switches to "Language: Arabic" with right aligned and "International Composer Alinea". Even though the standard preference is "Adobe Composer alinea". This makes me carzy!
Does somebody have an answer yet?
Working in InDesign CC2023 and it's still happening. ANY resolutions here?