iPhone Auto-Lock settings show inaccurate times

I’m finding that some of the Auto-Lock settings in iPhone are inaccurate. Here is each setting, and what I’m actually finding:

Setting: 30 seconds, actual: 30 seconds

Setting: 1 minute, actual: 30 seconds

Setting: 2 minutes, actual: 2 minutes

Setting: 3 minutes, actual: 3 minutes

Setting: 4 minutes, actual: 2 minutes

Setting: 5 minutes, actual: 2.5 minutes

Setting: Never, actual: Stopped timing after 10 minutes

iPhone 17 Pro Max, iOS 26.2.1

I had previously posted about an issue where my phone locked after a few minutes at a very inopportune time, when I had the Auto-Lock set to Never, and had placed the phone face down on a table. I restarted the phone, and now the Never setting seems to work. Has anyone else experienced the several inaccurate times above?