Stick Up Camera Elite - Motion detection not consistent

I’m concerned that this security camera didn’t detect this fishing boat near my boathouse. Any advice?Here’s my settingsRecord Motion ONMotion Alerts OFFMotion Sensitivity ALL MOTIONMotion Zone ALL WATERSnapshot Capture ON, EVERY 1 MINUTECamera location 10’ ABOVE WATER LEVELSee attached file. The first screenshot (from snapshot capture) shows the boat that didn’t trigger a Motion Event. The second screenshot show a boat in the distance that did trigger a Motion event.