It's 'ODT's Item Info' mod.
As soon as I installed it, I got the same thing... a <color> tag added to the beginning of the item names from the Olympus mod. Just a minor incompatibility between our mods but not game breaking.
A little bit annoying, yes. But still, the game is not broken in any way.
Edit:
Seems to only happen to this mod. My other mod, Holtzman Shield, is not affected by "ItemInfo".
File
Olympus 311.3.1

Type: Item Mod
Supported SPT Version: 3.11.0+
NOTE: Untested and Unapproved for use on older versions of SPT.
Change Log:
311.3.1 (The "I'm taking too long to update the mod because there are too many changes, so here's a placeholder" update.) ⏱
Supported SPT Version: 3.11.0+
NOTE: Untested and Unapproved for use on older versions of SPT.
Change Log:
311.3.1 (The "I'm taking too long to update the mod because there are too many changes, so here's a placeholder" update.) ⏱
- Support SPT 3.11.0+
- Added support for more firearms.
- Improved item conflicts for magazines/receivers.
- Added more magazines for a total of 210 magazines.
- Added loyalty level requirements for magazines.
- Added 4 tiers of magazines based on loyalty levels with stats