Did you wire and configure the X/Y/Z-MAX endstops, or the X/Y/Z-Min ones? Deltas need to use the X/Y/Z-Max. (The M119 output will say either X-Max or X-min, etc.)
You may also want to check that the endstop wire and stepper motor wire go to the same axis (tower) on your RAMPS board. At least one person has wondered why an endstop didn't work only to find out that it was wired to another tower that didn't hit the end yet.....
You may also want to check that the endstop wire and stepper motor wire go to the same axis (tower) on your RAMPS board. At least one person has wondered why an endstop didn't work only to find out that it was wired to another tower that didn't hit the end yet.....