Some additional information: Even when a trade signal occurs at exactly 15:19:00, it can take several seconds until the trade is executed and execution is reported back to Zorro. This delay depends on your Internet connection and the location of the server. We've never experienced a delay of more than 2 seconds, but we've heard of more than 10 seconds from other users. So the 8 seconds in your example can be normal.

Another reason why a trade is not executed exactly at the minute change is using an Entry limit.