Twitter tells me that I "New login to Twitter from Chrome on Mac"
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Is it a Twitter issue or Vivaldi?
Yes. Vivaldi identifies itself with a multi-faceted user agent string ("Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.117 Safari/537.36 Vivaldi/1.3.551.30") and Twitter picks what they like out of it and tells you that's what browser you are using.