I have very set routines. For example I have an absurdly complicated night time routine before I go to bed.
But on the other hand, I'm flexible, as long as I still understand and control what's going on. It's not OCD - if there's some reason why things have to be different, like if I'm tired and just want to go to bed, or if I'm staying somewhere else - I just change the routine. There's neither obsession or compulsion here, no anxiety, it's just the way I like to do things.
The problem is when the flexibility is unexpected and things aren't going the way I thought they would.