There are some skills I purchased that the game isn't letting me equip, help please?

There are some skills I purchased that the game isn't letting me equip, help please?

This is driving me crazy. I am only at level 8 but I just purchased "shrapnel" and for some reason I am unable to equip it. I also purchased "sharpshooter" and am unable to equip that. The reason why I see that I can't equip these skills is because when I am on the skill tree screen ,right after I level up, and I point the arrow on that skill , the Y button in the middle (on the right side on the bottom screen in the middle where you can designate which skill you want to use) goes dark, it doesn't light up like the other skills that I bought. I really want to use these skills. Someone PLEASE tell me whats going on here? Thank you very much! It happened again with "war mage" for my alchitect... not only will it not let me equip this skill after i bought it... but i just leveled up and used my skill point to buy the next level of "war mage" (the first of 3 upgrades) and it still won't let me equip it. Please anyone! Please help me. What am I doing wrong??

I just hit level 21 and still nothing. I really wanted to check out shrapnel for my gunslinger, its a shame. I am hesitant to waste a skill point on an upgrade for shrapnel to see if that will open it up, but i really don't think it will. oh well


Wow. So no one else is having this problem??? Or is it that I am the only one still playing this game?? I posted this question to 4 different sites and have gotten zero answers. I just don't understand.