Some of the weapons have missing textures. I'm using the latest version of the mod.

same issue, same exact weapons causing the issue. mod version 1.4.2: running on Quilt version 1.19.2: loader version 17.11 (latest)

I'm having the same issue. In my case I think it's due to an incompatibility with brrp used by Extended Block Shapes .

In theory, brrp only deprecates arrp's classes and methods which should allow arrp mods (medieval weapons) to use brrp.

I'm using Fabric 0.14.12 1.19.2.

Here's the log with only Medieval Weapons and Extended Block Shapes (disabling aarp).
latest.log

Yes it happens due to an incompatibility with brrp. Medieval Weapons uses ARRP.

I am as well, and can't figure out why. I own a server, and it upsets me that none of us can use any of the cool weapons. If anyone has any fixes, please let me know!

you can fix that, using this mod https://www.curseforge.com/minecraft/mc-mods/arrp/files

With the latest version of this mod you can use either BRRP or ARRP but not both at the same time.
Be aware that other mods can include one of these.