When I was little, I spelled jewelry "jewlery." That was how I pronounced it, so obviously that's the way you'd spell it, right?
Then my mom pointed out I was spelling it wrong. I had no concept of the word "jewel," apparently, so I didn't memorize the correct spelling. I just understood that I had an E out of order.
For many years when I wrote the word, I remembered I tended to spell it wrong, and it was something about the e, but I wasn't sure of the correct spelling. Pathetic, no? I agree. It is pathetic. But I ended up spelling the word "jewelery." You want an e? I've got one! Heck, I've got three!
By now I have learned how to spell the word correctly. It's jewelry. I even know how to pronounce it correctly too.
Isn't it great the things we learn as we get older?