Hi there. I think your cafe was already on the map. Someone mapped the Idlewilde cafe in August last year: osm.org/browse/node/1411222283
You put another cafe next to it yesterday, did you expand your business ;-) or did you want to move the location on the map?
If you find the editor too complicated, let us know your opening hours and website if you have one, and we add it for you.

Could it be a temperature issue? Leaving the etrex on the dashboard, it can get very hot in the sun, or cold in winter. Both would kill the batteries pretty quickly and probably damage the device too. So don't leave it in the car.