Ranger Studied/Favored Enemies

[Curve]

Description
Rebuilding ranger and you don't know what races are studied vs favored so you wing it and if you make the mistake of choosing races as feats that you had as studied then they count for both, and you loose a race.

Steps to reproduce
No steps other than to rebuild a ranger and choose a studied enemy as a favored enemy.

Expected result
The feat would replace the studied enemy thereby giving you the correct number of enemies.

Actual result
The race counts as a studied and favored enemy.

Screenshot(s)
N/A

Notes
I don't know a way to fix this other than to rebuild again.

edit* The system also seems to be erasing the count for how many of X race you have killed. My character who is level 30 and has killed a lot of half-orcs is now registering as 0/100

[Zan]

The Ranger studied enemy kill progress for the relevel I took were still in place. Perhaps taking them as FE rather than Studied erased the progress?