I added a label in the print composer of QGIS (3.6). I rotated the label, but then the font is no longer aligned to a common line. I think it is stair-stepping where the letters go, perhaps snapping them to discrete pixels or locations. I messed around with the Guides and Grid settings, but cannot seem to fix the problem. I have attached a screen shot, notice the label "survey grid". It aligns well when I zoom in.