Is scooping viewed negatively in the research community?
What you describe isn't &quot;scooping&quot;. Scooping is where you publish something that someone else is currently working on before they are able to publish it. Usually this is done without knowing someone else is working on it, and is something that happens to you (you were scooped), and not usually used to describe action of the publishing author (unless they did it intentionally).
The issue with your research is that, if this is your only work, it could be seen to lack novelty; it is only incrementally building on other peoples' results. That would possibly be weighed negatively in grant applications, etc.
In other words, I think that your research could hypothetically be viewed as not especially notable if you were applying for postdoc or faculty positions (I haven't seen it, and you say it was published in top journals, so this isn't necessarily the case). But

I wouldn't call this &quot;scooping&quot; and
I don't think this should be an issue applying for graduate school. Having publications will only be seen as a positive thing, and if they are in top journals that will look very good. No one is expecting an undergraduate to be be publishing novel research as a condition to attend graduate school.