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Can't figure out why if the seed phrase is wrong, then why does it pop up at all?
I don't know the likelihood of that happening on Metamask but it happened quite often when I was trying to restore another wallet on a different blockchain before (Waves).
From my experience on Meta, one wrong/misspelled word would not allow me to import.
I know it's my mistake? but it was probably clicking on a firefox update before this happened or downloading Big Sur to my Mac.
I doubt that. Any web browser update won't affect your previously generated seed phrase.
If I simply added account 2 and account 3 would they have generated a different account address.
Yes, you will get a new address when you click create account. How many addresses have you made so far?
When I reset the original account it gave me a new address with what I thought was the original seed phrase? I have that. Very curious?
I don't know mate. Maybe you really have another account prior to what you though as orginal?