My house has the garage directly under the second floor. The back wall of the garage seems to have pushed up on the second floor enough to have a 1×2 foot raised area that you can feel under the carpet if you are paying attention. I did not notice this until I walked to and from my room a bunch while moving things in. If I had to ballpark it, I would guess it is raised up by a quarter inch or a half inch. The length of the raised section may be longer than 2 feet, but a wall upstairs makes it awkward to feel past the dimensions that I described. There are no cracks in the walls or anything because the house was painted/touched up before I moved in. I went downstairs and looked very closely at the interior side of the garage wall in question and found they had touched up the paint right where a crack would have showed up from the shifting.The house was built in 1971 and has a sump and a french drain.Is this shift in the foundation a huge red flag? Do you need more details to give me advice on this? I had a structural engineer come to the house before I bought it and he did not notice this flaw at all. He talked to me about much more obvious things in the house, so I am fully confident he missed this issue.