You would find there are more people than places in countries like Rwanda and Burundi, where land is very scarce. However, in the case of eastern Congo, you do have land conflicts. If you are gone for a couple of years, in some cases people will leave a male behind to continue with agricultural activities, but if you have completely abandoned your property, somebody will come in, and that's where you become displaced. It doesn't necessarily mean that this person you displace when you come home doesn't have a place to stay, but there will be issues with claims of ownership.
Land disputes are prevalent across the region, particularly with regard to getting land titles. People don't necessarily have the titles, so it can be difficult to prove that the land belongs to you. Depending on how long you've been gone, this can definitely be an issue.