unfinished wood from ceiling showing at wall

[holm0326]

Hi! It was suggested I post here with this type of question, so I am happy to try! If you look closely at the image, it can be seen that unfinished wood is showing where my basement ceiling and basement wall connects in Home Designer Suite 2018. I can't seem to fix it after trying different things. Perhaps my settings are wrong, but I can't seem to figure out in which way. I am lost. I'm trying to finish this basement. Any suggestions as to why this is occurring? This unfinished wood line appears along the top of all four basement walls. Any help would be appreciated.