You may need to reset your system's default midi device. If you are on Windows 10/11 the easiest way to do this is with the Coolsoft Midi Mapper. You can download it here:
https://coolsoft.altervista.org/en/midimapper
Once you download & install it, run the program then select 'Microsoft GS Wavetable Synth' (or your other midi playback device if you have one) - click apply then ok and give EQ another go.