Welcome!
In these sorts of cases, I think it’s helpful to state what you expect to see from these plots and how these plots differ from your expectations.
That being said, the plots look ok to me. Roughly speaking, the plots show the proportion of zeros (to the left) and the proportion of ones (to the right). There are several pairs proportions plotted simultaneously. One pair corresponds to your data (the blue line). The others are generated by the model (in orange) and each draw from the prior/posterior yields a new pair of proportions. The mean of these proportions is in black. Does that help?