The three different definitions you encountered probably came from three different spiritual frameworks, and that’s before social media creators start taking creative liberties. Christian deliverance ministries talk about “godly” versus “ungodly” soul ties, with the ungodly ones formed through sexual sin or trauma requiring spiritual breaking ceremonies. New Age communities describe energetic cords connecting chakras and auras, often involving past life connections. Then you have psychology people who use the term soul-tie just as a new age term for attachment theory.
Where this all gets even worse is that there are plenty of references to twin flames in the Bible, while some groups are telling you that soul ties are “bad”.
Twin flames and soul ties can definitely coexist. During separation, which sometimes lasts years, you’re going to form connections with other people. Some call these “catalyst relationships” or even “false twin flames”. Soul ties that teach you what you need to learn before reunion happens. The twin flame bond itself remains underneath everything else.