• Topic changed from 'foo'
• Paradox changes topic to 'bar'

Remove the ^ near the start of line 5 to have the previous topic shown after the topic change

raw 332:*: {
  set %Topic- [ $+ [ $chan($2).wid ] ] $3-
}

on ^*:TOPIC:#: {
  echo $color(T) -nti2 $chan * Topic changed from ' $+ %Topic- [ $+ [ $chan($chan).wid ] ] $+ '
  set %Topic- [ $+ [ $chan($chan).wid ] ] $1-
}