Single post in LCB on a Pokemon that I wasn't chaining?

I don't know if this is actually a bug, but I just hatched a random melan Duraludon that has +LCB as a part of it's timeline. I'm currently chaining Ruffwool, not Duraludon. I double checked to make sure I didn't accidentally break my chain, but I did not. Is this suppose to happen? This is the Pokemon in question.