Reds feel like that to me on Nutaku often.
That might have something to do with having almost 50% of my non-event units being Slice types.
It took me two weeks to evolve Kerria becasue the first week gave me 2 Lv. 100 on my first run and none after that.
I have the opposite problem with hit types.
My Nutaku account only has 3 5* or higher non-event hit types but it likes to give me lots of Lv. 100 Blue Manyus and I have Lv.100 Blue Dragons from events sitting around unused.
Two of them are 6* (Flowering Peach and Lagurus) and I only got Lagurus Wednesday.
Lagurus stole all the luck from my DMM account it rolled 1 4* in a 10+1 after she showed up on Nutaku.
Edit: And this is my card today.