Masteries edit issue

Since the update, I've gone into 3 games where I was given the wrong masteries.

Either the save button seems to not work, or I am given an automatic preset, despite me saving.

Scenario: I have a mastery preset called "Switcheroo" and a "Singed" page. In my game that I was preparing to play as Singed, I select my "Singed" page. I click on the edit button but the mastery page I am shown is "Switcheroo". I maually make the dropdown choose my Singed page, save, click out. I reclick on the edit button and I am shown the "Switcheroo" page and that becomes my new mastery page chosen.

I've had teammates that had wrong mastery pages.

I really don't want to play ADC with tank masteries. TT_TT