My gaming PC’s RGB lighting syncs fine until I launch Steam, then it goes haywire

I built my gaming PC a few months ago, and one of the fun parts was setting up the RGB lighting with the motherboard’s software and a couple of Phanteks fans. Everything stayed perfectly in sync - colors, patterns, the whole vibe - until I started using Steam recently. The moment I launch Steam, the RGB starts flickering wildly and loses sync between the fans and the motherboard LEDs. I’ve tried updating all drivers and the motherboard’s firmware, and even reinstalling the RGB control software, but no luck. It only happens when Steam is open, and closing it immediately fixes the issue. I’m running Windows 11, and I don’t have any other overlay software running except Steam. I also checked Steam’s settings, but didn’t find anything obviously related to RGB or hardware control. Has anyone seen anything like this or know why Steam could be messing with my lighting? Is there a way to stop Steam from interfering without disabling the RGB effects completely?