.... The data logger just says Davis Instruments WeatherLink Data Logger on the top, and underneath it says mfg code C01122J20 LL.
I was really suggesting to say what kind of logger - serial, USB, or IP - sometimes that is important information, but probably not needed here.
I'm also presuming that your console is displaying correct, current data.
What download interval does your setup use?
In any case, I suggest you consider simply clearing the archived data in the logger (using WeatherLink). Warning: that will lose all of your data stored in the logger, but then it might work going forward.
Altrnatively, consider going through the setup process to set up a "new station" (i.e., new name).