I loaded in at 16:30 at Lewes Station on foot and I saw a Seaford Bound service stopped right at the end of platform as shown in the image below. I have loaded in many times at the same time and it still does the same thing.
sorry but the picture wont load but if you spawn on foot at Lewes at 16:30pm you will see what i mean on pc.
The same thing happens if you spawn there at 17.30 too. Oddly, if you spawn 5 minutes earlier, the trains arrive as they're supposed to and stop in the right place.