How to correctly utilise AssetBundles - Massive memory usage, 4x more than Resource folder

I'm having a lot of trouble figuring out how I am meant to use asset bundles so they don't take gigabits of RAM. I am downloading my bundles with:

Code (CSharp):

1. UnityWebRequest request = UnityWebRequestAssetBundle.GetAssetBundle(url,version,0)
2. AssetBundle bundle = DownloadHandlerAssetBundle.GetContent(request);

Then saving that bundle to a variable in a singleton for access during runtime: data_bundle = bundle; Then, when I need the images for my cards in the bundle, I load them all into a dictionary from the bundle like so:

Code (CSharp):

1. imageCache[imageName] = data_bundle .LoadAsset<Sprite>(imageName);

And then when a card needs an image take it from the imageCache.

I do the exact same thing with the Resource folder, the below two are the profiler for using the resource folder and using asset bundles when I load the same images into the cache:
AssetBundles: (1.66gb textures)

Resources: (0.66gb textures)


Something is obviously wrong here, but I have no idea what it could be and why.
Specifications:
Android build - I have built the asset bundles for android as well (I assume they use the same import settings as Resources)
Unity V: 2020.3.17

What could I be doing wrong?

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This seemed to be caused by different import settings on my assets from my resources and the folder where the bundle was being made.

I would still appreciate any advice on whether this is the correct method to use bundles.