Counting is not a strength of the AI image generators. As you know, this does create some frustration and it has been brought up before in these threads:
In the last thread above, I did discuss some techniques of changing prompts and using generative fill, but it is a challenging problem to solve, and at the end of the day, Photoshop might be easier to achieve exactly what you want. Another technique is to use a structure reference, such as a line drawing on the objects you want in the appropriate number/count.