When I try to click an ore to see what heights it generates at, it only shows "Block Loot Drop" info instead.

Is this issue server-related or does it also happen in singleplayer?

Getting this same issue

i have that the whole time in singleplayer. Dont know how to fix

RER only records these data when new chunks are generated. If the chunks have already been generated before adding the mod, no new data will be gathered.