Content Optimization Tool Glitch?

Recently launched our "Keyword Density & Frequency Checker" and it's been... interesting. It's a core component of our content optimization efforts, but it seems to have developed a mind of its own lately. It's almost like it wakes up on the wrong side of the server rack some mornings.

We're seeing some really inconsistent results. Sometimes, for the exact same text, it gives wildly different density readings – like a digital personality disorder. Other times, it just completely ignores common keywords that are clearly present, almost as if it's playing a prank. It's not a total breakdown, more like intermittent, unpredictable quirks that make you question your sanity.

Has anyone else experienced their content optimization or keyword tools acting a bit... possessed? What common pitfalls or debugging steps do you usually check for when a tool like this starts acting up?