Wait, why are we freaking out about this? The time it takes for Earth to complete a rotation has probably changed countless times over the centuries. We only know about it now because we have developed tools to measure it. It is kind of naïve to think anything natural will be constant with the models we've created for them.
Australian astronomer Fred Watson explained to ABC, saying “when you start looking at the real nitty gritty, you realize that Earth is not just a solid ball that is spinning.” “It’s got liquid on the inside, it’s got liquid on the outside, and it’s got an atmosphere and all of these things slosh around a bit,” Watson told ABC.