[Client] Bug - Selecting masteries brought up incorrect (someone else's) selection of mastery pages

What happened:

1. Get into ranked picks/bans.
2. Lock in champ
3. click the drop down menu to select masteries
4. Notice that they are incorrect.
5. When selected, an system error message appears

To fix:

1. select "edit masteries" button
2. list is back to my profile's list

http://imgur.com/eiNLtXc