u/ExaltedRequiem

So I'm using a Static Field build, currently supported by the Tal Rasha set to turn it into Mastery skill soup. And I'm running into something very odd when I try to upgrade all four mastery skills.

For some reason, I can only select one (1) upgrade per side between both Frost Orb and Meteor. If I pick Meteor's Immobilize, the game deselects Frozen Orb's Ferocity, for example. Any one run into this, or at least is willing to do some minor respec for science? Is this a real, if niche, problem or is it just my character being bugged?