I am on Gentoo Linux with Breeze-Dark theme, lxde-meta 0.5.5-r7, lxpanel 0.10.1.
The appearence is as follows:

This is doable on my secondary PC, but very much breaks my workflow on my main PC where I always used to use LXDE as a fallback, then switched to full-time because everything else had too many issues. Does anyone know what may cause this apparent graphical glitch?