[Script] Problem with adding in new Evolution Stones/Items in general

[DevidraGaming]

So I've recently been working on adding the already existing evolution stones as well as one of my own into Emerald through HMA, and to test it I tried putting one in the PC, and it's created some weird problems that I don't know how to fix. Putting details in a spoiler so as not to make the post super long

Spoiler:

New item locations:

Spoiler:

"image removed"
The four at the bottom are the items I added, Shiny Stone, Dusk Stone, Ice Stone, and Altered Stone. Everything seems like I'd done it alright, they look functionally identical to the other evolution stones

Data tables for each, with the Fire Stone data table for reference (flipped because I looked at the effects table first as opposed to the stats table first):

Spoiler:

"image removed""image removed""image removed""image removed""image removed"

Altered Stone location next to the Potion that goes in the PC, added through HMA:

Spoiler:

"image removed"

And then, when I loaded the edited rom in mGBA, looking in the PC presented me with this:

Spoiler:

"image removed""image removed"

I'm not sure why this is happening or how to fix it, but since I'm adding all the national dex mons, I'd like to be able to use the other 3 evolution stones. The Altered Stone would be used for changing a pokemon's regional variant, but it didn't function like a stone when I tried to use it, it instead acted like when you try to bike inside a building.

Lastly, a weird thing I just noticed that I'm also not sure how to fix. The Shiny Stone sprite shows up where the back arrow sprite should.

Spoiler:

"image removed"