I don't understand how the system decided to Autofill you

If I wait 2-3 minutes, I don't get Autofilled

However, if someone doesn't press accept, and then immediately after, 5-10 seconds, another match is found, I'm Autofilled

????????????????????????????????????? What

If I cancel the Queue, and restart it, I won't get Autofilled.

When I do get Autofilled, it isn't because the system took too long to find a match, I'm finding that both getting your roll, and getting Autofilled, have the same waiting time in Queue.

So what gives?