Is this preview or export?
export ,i use premiere pro cc
what OS and exact Pr build?
I'm curios, but along with giving Anne answer to her questions...
what is the name of font ? what size ( pt. ) did you choose when made ? Is it scaled up after going into timeline ?
where did you make it ( titler or photoshop)
seems to be a not so great font design maybe, but even aliased those weird vertical things puzzle me.