I agree with what everyone has said above. My stongest feeling is that there is overextrusion, I'm guessing that these were printed solid or close to it (given the small size of the cubes and amount of perimeters). Seeing that top cube most deformed is what makes me say that the most, because at the end of your print all the over extrusion happening in the bottom of the print builds up and spills out of the top cube's perimeters.

Also the top is likely deformed because the layers are so small that the plastic doesn't have time to fully solidify before new layers are added. In some slicers, there are settings to slow down the print above layer X or during the last X layers of the print, which might also help.