Heat maps look near identical for all words

[Shimarisu-kun]

The extension seems to generate heatmaps without producing any errors, but they all look more or less the same regardless of the prompt. Here is a simple example using the prompt "sports car on a street along the beach". As you can see, the heat maps for the words "car", "street", and "beach" look almost identical and seem to put emphasis on the car alone, completely ignoring the background.

I am using Stable Diffusion 1.5 with ayonimix_V6 as a model, DDIM sampling, and the default webui parameters for everything else. Using other models or samplers seems to lead to the same problem.

Not sure if this is a bug of some sort or if I am doing something wrong?