When in Sculpt Mode, I usually keep the X symmetry locked, which is useful. But isn't it also a bit inconsistent? now and then, while sculpting, i notice that the symmetry is not always perfect. is this normal? or am i doing something wrong (such as hittin without knowing some shortcut or something)?
There are absolutely inconsistencies, I believe it's a result of smoothing but may be wrong. Mesh is absolutely perfect before using sculpt mode (I checked), from the side in this image you can see that the mesh no longer aligns correctly. This was using X symmetry, the default brush (+ autosmooth) + smooth / autosmooth.