With Esignal I have the low of that bar as 30.53 and high of 30.55, so looks like you got a bad tick.
AMP is a broker/fcm, not the data provider/vendor.
60 min ZL chart from CME site...
NOTE: data source is CBOT, vs Globex on your chart.
View attachment 198182
Is there any different between globex and cbot?
I thought it should the same