You were missing something about Barcelona not have partner with 1XBET, regarding from Barcelona update news they have reach agreement deal become partner with 1XBET from 1st July 2019 through to 30 June 2024. I don't know about the same company between 1XBET and 1XBIT  after similar named between both casino gambling site.

Actually for 1XBET have been official partner for La Liga and if you watch all matches you see 1XBET logo behind goals keeper, I little sure with 1XBET become the same company with 1XBIT actually never have official partner with many football team not only in La Liga but also Serie A have the same official partner with 1XBET.

You can read here about Barcelona agreement deal become partner with 1XBET

https://www.fcbarcelona.com/en/news/1263451/fc-barcelona-adds-1xbet-as-a-new-global-partner