Known in real life as "Reverse Culture Shock" or "Re-entry Shock". A character returns home after a long absence and finds that they no longer fit in, either because their home has changed too much over time, or (more commonly) because they themselves were changed by their experiences. In the latter case, it can lead to a But Now I Must Go sentiment. In less extreme cases, the character may eventually settle down again with some effort. Often, characters placed in this situation will choose to put themselves back In Harm's Way. Has absolutely nothing to do with Stranger in A Strange Land.