Anyone else experienced something like this?

Summoned 10 units today...checking the natures immediately...

I got a 4* Soleil and thought to myself: "Well, my lone one is ATK+/SPD- and maybe the new one has better IV".

...she also was ATK+/SPD-

Then I got a 5* Ninian and thought to myself: "Well, mine is HP+/DEF- and maybe the new one has better IV".

...she also was HP+/DEF-

Then I got a 4* Raven and thought to myself: "Well, my best version is HP+/RES- and maybe the new one has better IV".

He also was HP+/RES-