after about 5 hours of trial and error (basically me removing 1 mod and trying again, with 48mods) i finally managed to get access to not only the Animal Tamer feat (with the 3 animal pens) but also some of the new Jhebbal Sag feats.
(i love vanilla as well as mods, it just happens to be that in this case, the culprit for me was this mod:
1501210306/BetterArchery.pak
and once removed, the other feats became visible again)
just in case anyone else has that problem. (it might be due to some recent archery work or just the way mod data items are not fully unique yet, but it might get patched up)