Can someone ease my paranoia and please explain this to me...

This seems to keep happening. I'll order, i always tip minimum $8 bucks and i never order farther than 2 miles from my house. I will increase the tip after, but never decrease the tip. So... Someone will take my order, go there pick the food up. Then drive around for 10-15 minutes with my food in directions not near me. They'll even pass my road, and go out of there way to other places. I've never complained but i do wonder... what are they doing and why? This moves my expected delivery time as well. Makes the food cold etc.

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So are they just running errands? They spitting on my food? Taking something out? Hoping i will cancel? Even when I'm missing items i never complain. I'm just curious but its been enough to turn me off using the app which is good my waistline and wallet.