Zcoretri asked me earlier how to set things as targetable. When I just tried, it didn't seem to work like I remember. "good_bench" for instance, in my world is spawn ID 2530120. When I type in the command, it says the spawn was updated, but the bench is still not targetable.
I went into the DB and forced targetable, show_name, show_level, attackable, everything I could find to 1, and still I cannot move the benches anymore. I do not know when this stopped. I could have sworn I flipped that backwards bench around a few weeks ago, but who knows.
Can you give it a try on your server(s)? Maybe it's my data?