Base perks not tier 3????

I have a level 50 Dwight with only bond 2, a level 50 Meg with sprint burst 2 and a level 50 David with WGLF 2. It's strange and annoying as these perks are the characters base perks, so you would have hoped by level 50, have these tier 3?!?!

I mean I am level 15 with some survivors and have a few tier 3 perks already! What's going on?? Or is that the luck of RNG? 

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