monitor arm keeps tilting down

Monoprice 15-in-1 Triple-Display MST USB-C Docking Station, with Multiple Display Modes, HDMI, SD/TF, RJ45, 3.5mm Audio, PD, For Macbook and Windows

Kantek Wide Deluxe Two-Level Monitor Stand, 20" x 13.25" x 3" to 6.5", Black, Supports 50 lbs

Targus 4Vu™ Privacy Screen for 15.4” Widescreen (16:9)

Targus 4Vu™ Privacy Screen for Microsoft Surface™ Book 13.5” and Surface™ Book 2 13.5”, Landscape

Targus 4Vu™ Privacy Screen for 17.3” Widescreen Monitors (16:9)

Innovera Premium Antiglare Blur Privacy Monitor Filter for 19" to 20" Widescreen Flat Panel Monitor, 16:10 Aspect Ratio

Targus 4Vu™ Privacy Screen for 15.4” Widescreen Laptops (16:10)

Targus 4Vu™ Privacy Screen for 17” Widescreen (16:10)

Targus 4Vu™ Magnetic Privacy Screen for Samsung SH850 Series 23.8" Landscape

Kantek LCD Protect Privacy Antiglare Deluxe Filter for 19" to 20" Widescreen Flat Panel Monitor, 16:10 Aspect Ratio

Innovera Blackout Privacy Filter for 19" Widescreen Flat Panel Monitor, 16:10 Aspect Ratio

Targus 4Vu™ Privacy Screen for 19.5” Widescreen (16:10)

Targus 4Vu™ Privacy Screen for 20” Widescreen (16:9)

Targus 4Vu™ Privacy Screen for 21.5” Widescreen (16:9)

Kantek Dual Monitor Articulating Desktop Stand, For 13" to 27" Monitors, 32" x 13" x 17.5", Black, Supports 18 lb

Targus 4Vu™ Privacy Screen for 23” Widescreen (16:9)

Targus 4Vu™ Privacy Screen for 23.5” Widescreen Monitors (16:9)

Mount-It! Tilting TV Wall Mount Bracket for Small TV and Computer Monitors, Low-Profile Design with Quick Release Function, Fits Up to 27 Inch Screens

Compucessory Privacy Screen Filter - 20" LCD (CCS20512).

Monoprice Adjustable Folding Laptop Stand - Steel Ideal For Work, Home, Office Laptops - Workstream Collection

Mount-It! Kitchen Under Cabinet Mount TV Ceiling Mount Folding Bracket, 90 Degree Tilt, Fold Down, Swivel for 13 to 23 inch LCD, TV, LED, Monitor

Monoprice Multimedia Desktop Stand 22" x 9.5" - Stand & Riser, Laptop Stand, Desktop TV Stand w/ Height Adjustable Legs - Workstream Collection

Mount-It! RV TV Mount, Lockable Full Motion TV Wall Mount Designed Specifically for RV or Mobile Home Use Single Arm Tilting & Swiveling 42 Inches Max

Mount-It! Full Motion Retractable Monitor Wall Mount, VESA Bracket for Computer Screens up to 30 Inches, Articulating Arm Fits Screens up to 30 Inches