Ok then I want you to tell me how my computer did not lock me out and how it allowed me to continue diving, only flagged me to do 3 minute safety stops for all 4 dives on one day and only 2 safety stops on the morning dives the next day but not the afternoon dives. The computer did not lock me out at any time.
And yes it was in dive mode because it logged the dives, and I double checked it to make sure it was.
Since you are going to be that guy why dont you send me a dive computer that will do all of the things that you say that mine is supposed to do and hasnt done.
It seems you are comparing NDL limits from tables with NDL limits from the computer, in order to explain a DCS hit. It doesn't work like that. The tables assume you drop straight down, spend all your time exactly at the deepest depth and finally you ascent pretty much straight up up (with a maximum ascent speed).
The computer will measure your depth every second or so, and recalculate your remaining NDL based on your actual profile. That means that if you descent slower than a brick, or go to your deepest point for a shorter period, or come up gradually, or most likely all of them combined, your NDL will be longer compared to that from the table.
All that NDL does is indicate your risk of DCS. If you stay within NDL, chances of getting a DCS hit are low. If you go over, they increase. There is no absolute guarantee either way. Like DAN (and myself and others in earlier posts) pointed out, DCS is an unpredictable beast, with a lot of factors that can make a difference. NDL is only one of many.
Your computer can not determine your hydration level for example. It can only help you manage NDL. It did exactly that, and going by your posts, it worked as intended.
That means your statement that you had to do a 15 minute deco stop is confusing at least, and considering your computer did not give you a deco obligation it is actually even inaccurate / plain wrong reasoning.
It's kinda like saying your car dashboard is wrong because it gives you more miles per gallon currently while driving 30 miles an hour compared to what you looked up in the booklet for mpg with 60 miles an hour.
As a potential DM / OWSI / Specialty Instructor / MSDT I highly recommend you read up on this. Check the last chapter of the OWD manual for more info. Other sources are the encyclopedia of recreational diving (part of your DM kit) or this forum.
Finally, what computer were you using again? I am willing to bet you can find the manual online, including a picture of what a decostop / lockout would look like.