Relic Seeker Bug

The card states, "...give your first creature 1/+2".

Not sure if I'm interpreting this wrong, but every time I use it it gives my creature +2/+2.
I had a 1/1 creature and when Relic Seekers ability kicked it I then had a 3/3, next turn I had a 5/5.

Is it suppose to work this way?