Don’t you hate it when…
In a hurry to finish off one part; just for convenience you place a character in Location A. Then later on in your eagerness to write THAT very important chapter around which, if not the whole but at least a vital part of the narrative revolves you have them appearing Location B which is many miles distant from Location A and in a circumstance which defies any good reason you can think of to explain that anomaly.
If you are very fortunate you will have dropped them off at Location A in such a casual way you can write that smidge out and in retrospect shuffle them into Location B ready for THAT chapter you have ben itching to write.
Meanwhile you look at yourself in the literal or allegorical and say: