(I have an undergrad degree in Psychology.) Psychology has the means to be a proper science, but historically a significant amount of hasn't been. The examples you present tend to come from neuroscience, which in turn tends to be a much more empirically based field.
- http://www.nature.com/news/over-half-of-psychology-studies-f...
- https://www.scientificamerican.com/article/psychology-s-cred...
- https://digest.bps.org.uk/2017/05/25/was-the-crisis-in-socia...