Hi @Varan_15 ,
Based on your description, I have created a simple sample:
Usually your y-axis and second y-axis are opposite each other, which causes your line chart to overlap with the stacked bar chart. You can make the line chart above the bar by adjusting the interval between the two y-axes, like this:
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.