That is absolutely normal behavior for that species, and many other understory species affected by above-average deer browse.
I see this situation all over the park properties we steward here in Louisville, KY - where deer access is unimpeded by hunting or any other natural control.
Lindera benzoin is not "naturally" a tree or a shrub exclusively. Its habit will be dependent on many factors, environmentally and climatically. Cold damage, physical damage from browsing or ice/snow loads, girdling by smaller furry rodentia - all these contribute to changing forms in this species and others.