Problem with keyboard shortcut for jumping between sections in R studio

I'm having trouble jumping up and down between sections (#### or ----) in R studio. When I use the standard Ctrl+PgDn, my frame jumps exactly 18 lines instead - regardless of whether this is a new section or not.
I can see that my sections are correct, because they are marked with a little grey arrow and appear in the jump menu.
I've tried changing the shortcut to "Alt+PgDn" and "Ctrl+Alt+PgDn" but it still jumps exactly 18 lines.

I have RStudio 2026.01.0 Build 392, Windows 10 x64

Anyone with a solution to this?