Hopper mine cart not picking up farmed crops above it in automated farm [bedrock]

I play on PC, v1.21.120. I just finished making an automated pumpkin and melon farm. Everything seems to be working except the hopper mine cart hardly picks up any of the farmed crops on the layer above at all. It does it some. I did a smaller version of this that is almost exactly the same it works perfectly. It's just much smaller, entirely closed in, and the mine cart goes faster, but I don't see how those could be the issue for this larger farm. I am including photos below. Would really appreciate some help.

https://preview.redd.it/66modkvfgqyf1.png?width=2599&format=png&auto=webp&s=5daa56e0795277f4960051245b2bbd36075b3aac

https://preview.redd.it/fm6e2lxigqyf1.png?width=2927&format=png&auto=webp&s=9efd9c1f8188062a95ba939f3fb81d2092b09c3e

https://preview.redd.it/d5t0k0nlgqyf1.png?width=2358&format=png&auto=webp&s=cab084b273792994c44f5fafa85e1b71275ccb20