l hit goal and immediately gained two pounds if I recall correctly. I spent the next two months going up and down up and down. In fact, a bunch of us maintainers did if I recall having this *conversation* at one time or another. After those two months, I decided to lower my goal weight and took it down another 11 pounds. And yes, I still go up and down, but now since I am lower the ups aren't quite as high a number, barring a couple of instances.
I know for me, and heck yes we're all different, I like keeping my calories identical during the week for maintenance that I did while I was losing. It's what I know, it's what I'm comfortable with. It works for me. So it didn't make sense for me to change that. For me to have added in calories would have been disastrous - leaves the door open, too many variables - you don't fix what ain't broke. So my extra calories come on the weekends.
Nothing is broken. Nothing is unfixable. No matter what happens during the *figure it out stage* - you can't gain back 120 lbs in a week.
Trial and error. That's what it's all about. You're entering a new stage and have to learn how to navigate it. And that's what you're doing. You WILL figure it out.