I have a low-traffic website (under 100 unique visitors per day) and I've encountered a strange issue started yesterday morning. I acquired three back-links, one of these back-links is contextual and the other two are site-wide. The site-wide back-links are from PA 40+ blogs. It looks like the back-links are already indexed by Google.

Despite these new back-links, my rankings across multiple keywords have dropped several positions. I'm new to SEO, but I would assume new back-links would improve my rankings. None of these back-links are low quality links, they are from real established blogs with high domain and page authority values.

Could anyone give me insights into why my rankings may have dropped with new back-links?