engine coolant leak? what to do.

Was it a flush or a drain and fill?

I have heard of people having issues after coolant flush.

 

The question is why they even removed those when the drain petcock on the radiator is like a foot away from those hoses.

Glad you got it figured out though. Did you wait till the engine was cold (to avoid steam explosion) and then check the coolant level in the actual radiator? The coolant should be up to the neck. Also, keep an eye on the coolant reservoir for a few days, sometimes there is air that burps it’s way out and then the radiator pulls coolant from the reservoir tank.