Hahaha, no worries man - it's my fault. It's gonna take me years to shake this mad-scientist subtle hacker reputation I've earned. Yeah! You're right, I've got custom weapon icons that I put into the weapon .txd files myself. You know what, when I said "re-install", I meant replace "Program Files\Rockstar Games\GTA San Andreas" with a "completely unmodified" version that I saved to an external hard drive. I re-install the game quite frequently, as you may imagine. All this time, I had THOUGHT that my "completely unmodified" gta3.img file only contained the HD radar mod - clearly it also contains the weapons; my bad. Although, the cleo and src folders are completely missing from the San Andreas directory, which are the only scripts able to modify the game's behavior (aka not charge me for a respray). ASI scripts can as well, but I don't think they work without CLEO, and there are none anyways.
I'm running the game clean now. My buddy is coming back from the army for a few weeks, and he plays SAMP with me. So, gotta make sure my game is clean and functional for that...
...I don't even have car mods installed! Gasp!
**UPDATE**
I'm sure after telling you "I only haz this mod" and you caught me with another - you probably doubt my reassurance that I don't have CLEO installed. Well, when I pause the game, look in the lower left corner. If CLEO were installed, it'd say "X out of X scripts loaded". Ain't there! *Puts hands where you can see them*