Paste your mod list -- you're likely using some mods that conflict with each other, and my guess is that one of them is trying to call a blueprint actor that interferes with Rotary Overdrive.
For future reference, mod conflicts should be reported on their respective mod.io pages. BetaHub is for the standalone game, and does not cover modded issues.

Sorry, thought since the game had official mod integration that we could report issues with verified mods messing with the game here.

Mod List:

A Better Modding Menu: https://mod.io/g/drg/m/a-better-modding-menu
Ammo Indicators: https://mod.io/g/drg/m/ammo-indicators
Barrage Infector Range Indicator: https://mod.io/g/drg/m/barrage-infector-range-indicator
Better Explosion Range Indicator: https://mod.io/g/drg/m/better-explosion-range-indicator
Better Lok Indicator: https://mod.io/g/drg/m/better-lok-indicator
Better Post Processing: https://mod.io/g/drg/m/better-post-processing-reloaded
Better Spectator: https://mod.io/g/drg/m/better-spectator-reloaded
Better Visibility Uplink / Fuel Cell Bubble: https://mod.io/g/drg/m/better-visibility-uplink-fuel-cell-bubble
Better cracking boots: https://mod.io/g/drg/m/better-cracking-boots
BhaBarnacle Hitbox fix: https://mod.io/g/drg/m/bhabarnacle-hitbox-fix
Brighter Aquarqs: https://mod.io/g/drg/m/brighter-aquarqs
Brighter Objects: https://mod.io/g/drg/m/brighter-objects
Build Inspector: https://mod.io/g/drg/m/build-inspector
Camera Shake Control: https://mod.io/g/drg/m/camera-shake-control
Cave Leech Sound Attenuation Fix: https://mod.io/g/drg/m/cave-leech-sound-attenuation-fix
Clearer Pings: https://mod.io/g/drg/m/clearer-laser-pointer
Combined Resources: https://mod.io/g/drg/m/combined-resources
Custom Hitmarker, Hit Sound & Kill Sound: https://mod.io/g/drg/m/custom-hitmarker
DRGLib: https://mod.io/g/drg/m/drglib
Death Marker: https://mod.io/g/drg/m/death-marker
Disruptive Audio Removal Pack Plus: https://mod.io/g/drg/m/disruptive-audio-removal-pack-plus
Dwarf -to- Kobold voice pack: https://mod.io/g/drg/m/dwarf-to-kobold-voice-pack
Dynamic Cylinder Swap (Bulldog Revolver): https://mod.io/g/drg/m/dynamic-cylinder-swap
Fast Deposit: https://mod.io/g/drg/m/fast-deposit
Helldivers 2 Killstreak Counter: https://mod.io/g/drg/m/helldivers-2-killstreak-counter
Hold to Jump / Bhop: https://mod.io/g/drg/m/hold-to-jump-bhop
Instant Enemy Healthbar: https://mod.io/g/drg/m/instant-enemy-healthbar
Missions HUD: https://mod.io/g/drg/m/missions-hud
Mod Hub: https://mod.io/g/drg/m/mod-hub
More FOV: https://mod.io/g/drg/m/more-fov
More HP Bars: https://mod.io/g/drg/m/more-hp-bars
Multifunction Indicator (former Ammo Indicator): https://mod.io/g/drg/m/ammo-indicator
No Mission Control Ducking: https://mod.io/g/drg/m/no-mission-control-ducking
No Ragdolls: https://mod.io/g/drg/m/no-ragdolls
No ShoutBox: https://mod.io/g/drg/m/no-shoutbox
No Tinnitus (Updated): https://mod.io/g/drg/m/no-tinnitus-updated
No Web No problem: https://mod.io/g/drg/m/no-web-no-problem
One-click Promotion: https://mod.io/g/drg/m/one-click-promotion
Quick Pickaxe: https://mod.io/g/drg/m/quick-pickaxe
Quick Reload: https://mod.io/g/drg/m/quick-reload
Real Weapon Stats Classic (abandoned): https://mod.io/g/drg/m/real-weapon-stats-classic
Reduced Terrain Destruction Particles: https://mod.io/g/drg/m/reduced-terrain-destruction-particles
Refinery Pipe QoL: https://mod.io/g/drg/m/refinery-pipe-qol
Remove Decals: https://mod.io/g/drg/m/remove-decals
Save Last Used Hazard: https://mod.io/g/drg/m/save-last-used-hazard
Shield Expiration Colors: https://mod.io/g/drg/m/shield-expiration-colors
Simple Mission Control UI: https://mod.io/g/drg/m/simple-mission-control-ui
Status Effect Duration Indicator: https://mod.io/g/drg/m/status-effect-duration-indicator
Warm Light Flares: https://mod.io/g/drg/m/warm-light-flares
Weapon Skin Transfer: https://mod.io/g/drg/m/weapon-skin-transfer

No worries. GSG just doesn't intervene when it comes to mod development, verified or not, so issues with mods should be taken to their respective creators instead.
"Real Weapon Stats Classic" is your culprit. There's a backup version of this mod that doesn't intervene with Rotary Overdrive, and you can find it here: https://mod.io/g/drg/m/real-weapon-stats
All the best!