There are two actions (Cut, Delete) that want to use the same shortcut (Shift+Del). This is most probably a bug.
I tried it and it didn't happen using Kubuntu 17.04 and the git version of Krusader. Can you try using a new version of Krusader? (2.4.0-beta3 is no longer supported). In order to use the git version of Krusader there are instructions in https://cgit.kde.org/krusader.git/plain/INSTALL
I can confirm this (in 2.6). Will fix it...
And thanks for reporting.
Git commit 813df9f40a08b196e0016ee98c33c621386a9c12 by Alexander Bikadorov. Committed on 17/06/2017 at 16:42. Pushed by abikadorov into branch 'master'. Panel: removed second shortcut SHIFT+DEL for "cut" action due to conflict Dolphin does the same. FIXED: [ 381179 ] Shortcut conflict: SHIFT+DEL used for cut and alternative delete M +6 -1 krusader/Panel/listpanelactions.cpp https://commits.kde.org/krusader/813df9f40a08b196e0016ee98c33c621386a9c12