There is a funny behaviour in the text processor whereby two dots e.g.
cause it to display successively edited versions of your post!
It is obvious when it happens but some people submit a post and don’t look at it afterwards.
Best to use three dots in that case
so..
so..
??
Not so.. ??
or?
That sounds like it might open the door to a mild version on this: https://www.owasp.org/index.php/Cross-site_Scripting_(XSS)
Only to posts you made yourself, it seems.