the hybrid inverter has two isolated section the AC side and the DC-DC side.
the grid (AC side) which works for the synchronization of correct phase sinusoidal wave form, The AC grid section uses power and consumes as self feeding to power himself and not relying from the isolated DC side.
The consumptions depends how clean the grid is, the more distortion the more power usage. Aside from that there are also called Reactive power which cannot controlled by the inverter this is produced by inductive loads that also called the float power loss.
Not only Deye having this consumptions even other brand hybrid system have this.