I had something similar to this.

The culprit for me was editing which keymaps used the FTL modifiers.

In Key Maps >> General (Top Pane).
On the Left if you click on FTL Assist Me, FTL Follow Me or FTL Target Me.
Each of these should have the 3rd option "World of Warcraft: Use FTL Modifiers" set to On.

Every other Keymap should have this setting as "Default".

Once I reverted the other keymaps to default, this issue went away for me.