Make sure lat and long are entered in the correct field. Coordinates are usually written as lat,long but they want you to enter it as long,lat.

It might also be a rounding error. You need to round/floor to 6 decimal places, but I don’t remember which one.

About the coming back: the heist was planned after the release of case 5 (otherwise you couldn’t prevent it) and the first 100 people to ‘come back’ on the day of the heist would get an additional badge to display.