The answer to 'why is my rat recurring problem' is that rats are persistent and resilient pests that can be difficult to eliminate completely. Rats are attracted to readily available food sources, shelter, and nesting materials in and around your home. Even if you think you've gotten rid of them, they can quickly return and re-establish themselves.
Some common reasons for a recurring rat problem include improper or incomplete pest control methods, entry points in your home that allow them to keep coming back, and a continued food source that draws them in. Rats are also excellent burrowers and can make their way back into your home through tunnels and cracks in the foundation.