Safari/MacBook peculiarity

I have closed all tabs on Safari on my Iphone. When I open my MacBook, there are several that show they are still open there. Even though I closed them months ago! It's only a few, and the time/content/etc. seem totally random. A word I looked up in September, info on a dog facility from November, and now a court record I looked at in December. Maybe five or six of these, total.

I went to the Apple support site and learned I was not alone. I followed all directions there about turning iCloud off/on, turning machines off/on, etc. It seemed to work. Two days later? There they are again! So weird!
I again cleared all Safari history on my phone.
Three days later, they're back.

I just finally removed Safari from my phone's home screen, downloaded Opera, and I'm using GoDuckGo for searches. This will just give me a break while I work up the energy to call Apple and get some help with this.

In the meantime, if it's happened to you, how did you fix it? Such a minor irritation, but with enough repetition it's become bigger than it deserves to be.

Happy New Year to all.