Pro tip: The exact number of steps to my kitchen sink is wrong in my head

I've lived in this apartment in Cincinnati for seven years. Every single morning, I walk from my bedroom door to the kitchen sink to fill the kettle. For years, I was sure it was 15 steps. I even counted them out loud for my niece once. But last Tuesday, I decided to actually count them properly, heel to toe, and it was 17. Not 16, not 18, but a solid 17. I've done it every day since and it's always 17. My brain is so convinced it's 15 that I still feel a weird jolt of surprise on the 16th step. How can a daily routine I've done thousands of times have a wrong number stuck in my head? Has anyone else had a simple, physical fact about their own home just be wrong in their memory like this?