Taskbar glitch when a tray bubble appears with StartIsBack++

This is what I get whenever I get a tray notification... Is there a way to fix this? I'm on LTSC 2019 (1809) using StartIsBack++ version 2.9.11 and this still occurs with the latest version of the software...
It's the last (or one of the last) obstacle I'm getting before getting a fully accurate look without WindowBlinds' bloat and it's very bothering because I use VLC to listen to music and those notifications keep appearing whenever a song ends. Is this caused by other programs, such as 7+ Taskbar Tweaker? Also, the tray icon that notified me and the Show Desktop button stay there like on the screenshot until I click on the expand tray button for some reason.