Half of the heatmap generated by plotheatmap became black

Hi, I used the plotheatmap to draw the heatmap of my ChIP-seq data.
However, the right part of the heatmap is all black.
I follow the instruction of this website (Step-by-step protocols — deepTools 3.5.0 documentation).
Can anyone tell me what can go wrong in my analysis?
Also, what does the value of the y-axis mean in the above plots? The value looks very strange compared to plots shown on the website.