A PSR E323 is an older Yamaha “home keyboard”. It is not a control surface. The data list which specifies the MIDI capabilities is available here.
It can only send a few MIDI CCs, here is the list…X means it cannot transmit those CCs.
0 and 32 is patch bank select, 7 is MIDI volume, 10 is pan, 64 is sustain pedal, 72 is amp decay, 91 is reverb depth and 93 is chorus depth. It’s unlikely that Smart Controls would be mapped to those CCs by default.
To be sending those CCs (or any other data) all the time suggests that the onboard accompaniment section is running.