Yes, they can occur. They do occur, actually
To trannsform a non-directional wave from a into a beam or lobe (directional) usually produces "side lobes" (usually at right angles with the intended main lobe, with less power). It happens with radar lobes, as well as in Localizers (not locator, by the way, locators are NDBs).
Think of the reflection of a light beam in a wall. You will se "side lobes".
If you arm LOC too early you can intercept one of these, instead of the main one.
I have never had an experience with a fales G/S, or I do not recall it.
Does any one of you who has had such an experience?