Yes.
Expecting more precision than is actually delivered by the scope's A-D converter system... and being fooled by waveform aliasing artifacts...
What you see on a DSO is not always what your actual signal should look like. This topic is covered to some extent in the scope's manual, but there really isn't room there for a comprehensive treatment. There has even been some discussion here as to whether or not the DS1054Z correctly implements the sin(x)/x interpolation algorithm properly.
Some DSO signal artifacts can approach "art":
Also, a low-end DSO like the DS1054Z doesn't do as well in the X-Y mode compared to even a basic analog scope. You can see the difference in various videos that compare the display of the "oscillofun" track between DSO and analog scope.
Still... you'll like using the DSO very much. I'm hardly ever using my analog scopes any more.