GBPUSD - break out? Why

Placed a long at 17:00 1.4360(a bit late 1.4296 would have been better) based on the day’s uptrend and the S*R lines being strong - the PA bounced of these multiple times already today. Expected it to keep going yet at 0300 we get a break out to the down side which hit my SL on the Pivot line.
ANy ideas why? Should my SL have been lower at 1.4269 - that would have been pretty wide base don my entry.