Hello,
Windy only visualizes raw data from weather models developed by major weather centers.
Have you tried to compare other models to the default model, the ECMWF one?
Over your country there are 3 other models available in Windy, GFS from NOAA, ICON and ICON-EU from DWD.
You don't say exactly where (at what location) you got these wrong forecasts, for which parameter (wind, rain, temperature, etc.) and at what time frame (the same day or several days ahead)?