Yes the signals should stick once the market is closed. But if you download data & run analysis before market close, the data for the current day is not yet complete, so analysis may or may not change later when you run it again.
You say you ran your ToDo List at 3:55PM EST which is 5 minutes before the close...with delayed data. To make sure you have complete data for the day you'll want to wait until at least 4:20PM EST. Then when you run the ToDo List it shouldn't have any new data to download, & that should eliminate any possible changes occurring with analysis.
If you still see it or have any doubt, make a screenshot of your OT after you complete your ToDo List & place your trades. Do this for a few days if you want. Then if you see it change, make a second screenshot showing the change & attach both pictures. Click here for help with screenshots.