More than likely you racked it too early to begin with, and that's why it has started off again with a new krausen...or there was a change in temp, or the carboy got nudged and kicked the yeast into action again..
All perfectly normal. Nothing really to worry about.
Did you take a hydro reading before moving it to secondary, or did you simply go by arilock bubbling or just arbitrarily decided to move it befreo checking to see if it was ready to move....
When I secondary (which is rare,) I wait 2 weeks, then rack it for another 2 week, but I, like many of us on here skip secondary and instead opt for a month long primary.....
But either way, your beer is fine...and in the future wait at least til day 7, take a hydro reading, then again on day 10, if they are the same, THEN you can rack.
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