change map! to map

map! already changes self.tags in place, so the self.tags = self.tags.map! is redundant

app/models/fact_check.rb

@@ -59,7 +59,7 @@ def self.get_exported_data(query, team)
 
   def clean_tags
     return if self.tags.blank?
-    self.tags = self.tags.map! { |tag| tag.strip.gsub(/^#/, '') }.uniq
+    self.tags = self.tags.map { |tag| tag.strip.gsub(/^#/, '') }.uniq
   end
 
   private