This is actually what I was referring to in this thread: Can I make a deadline 2 am instead of midnight? - #2 by shanaqui
If you have any thoughts on how we could allow custom deadlines without this issue, then we’d love to hear about it! As it is, you need to be above/below the line on a given date on the x axis, right? It matters less on an early-bird goal, where you’d be entering the data early, but if you change your deadline and you have until after midnight to enter data, then you can see what would happen. You need +5 on the 18th, you have until 2am on the 19th, so you enter data for the 19th… and the graph derails, because your data on the 19th does not satisfy the goal on the 18th.
Personally, I’d be fine if we just scrapped custom deadlines and kept the simplicity of “midnight is the deadline”, same as for autodata goals, but enough users find them useful/essential that I doubt that idea would ever fly! But if you do have any thoughts on how to solve the problem, it could be useful to hear.