monitor arm keeps tilting down

LeisureMod Celeste High-Back Leather Office Chair with Headrest - Modern Iron Frame Swivel & Tilt Executive Desk Chair

LeisureMod Brio Ergonomic Mesh Office Chair - Breathable Lumbar Support - Adjustable Swivel & Tilt Computer Desk Chair

BALHAM TRADE-Office Chair with Adjustable Height Mid Back Support Flip Up Arms Lumbar Support Breathable Mesh

LeisureMod Benmar Office Chair – Upholstered Mesh Mid-Back Computer Chair with Adjustable Swivel and Tilt, Ergonomic Desk Seating for Home Office

VEVOR Active Chair with Handle, Height-Adjustable (24.6-34.4") Wobble Chair Made of Elastic Fabric & 45 mm Foam, 8° Tilt Angle, Age 12-18, Black

LeisureMod Aleen Modern Leather Office Chair - Swivel & Tilt Ergonomic Desk Chair with Iron Frame - Home Office

LeisureMod Nift Series Office Chair – Mesh Breathable Back with Headrest, Adjustable Height, 360° Swivel and Tilt, Home Office or Conference Room

LeisureMod Harris Ergonomic Desk Chair - High-Back Leather Computer Chair with Adjustable Tilt & Black Iron Base

Ergonomic Mesh Office Chair with Wheels, Lumbar Support, 3D Armrests, Hidden Footrest & Lockable Tilt for Home Office

LeisureMod Adorit Ergonomic Mesh Office Chair - Adjustable Arms & Lumbar Support - Mid-Back Swivel Computer Desk Chair

BALHAM TRADE-400LBS Big and Tall Office Chair Heavy Duty Leather with Padded Flip-up Arms Swivel Rolling

LeisureMod Evander Modern Black Faux Leather Office Chair - Sturdy Sled Base - Ergonomic Desk & Guest Seating

Boss Office Products Multi-Function Mesh Task Chair Black: Ergonomic, Lumbar Support, Swivel, Adjustable Arms

Velvet Office Chair Desk Chair with 360 Degree Swivel Wheels Adjustable Height Tilt Function

Maxwell Upholstered High-Back Executive Office Chair in PU Leather, Adjustable Height and Arms, Knee-Tilt & 360° Swivel, Ergonomic Computer Desk Chair

Okak Ergonomic Office Chair with Adjustable Lumbar Support, Upholstered Computer Chair with Adjustable Headrest and Armrest for Home, Office

BALHAM TRADE-Ergonomic Office Chair Adjustable Lumbar Support 110-130° Tilt 3D Armrests Rolling with Headrest

LeisureMod Nexa Ergonomic High-Back Office Chair – Adjustable Height, Swivel, Tilt, Padded Headrest, Lumbar Support, Desk Chair for Home Office

Okak Modern Ergonomic Office Chair, Computer Chair with Integrated Headrest and Tilt-Back/Lock-In Control, Comfy Chair for Office, Reading Room, Black

Ergonomic Mesh Office & Gaming Chair with Footrest, 3D Armrests, Dynamic Lumbar Support and Tilt for Home Office

Swivel Gaming Chair Gray - Room Essentials™: Upholstered Computer Desk Chair, Adjustable, Fixed Arms

Bestier Big and Tall Executive Office Chair with Flip-Up Arms, Adjustable Height, Reclining Office Chair with Headrest & Side Pockets

Style Ashland Home Office Chair - Serta

KERDOM High Back Ergonomic Office Chair, Breathable Mesh Desk Chair with Headrest and Flip-up Arms for Office