monitor arm keeps tilting down

j5create 4K60 Elite USB-C Triple-Monitor 10Gbps Mini Dock, JCD397

StarTech.com Thunderbolt 3 Mini Docking Station - Dual Monitor Dock for MacBook and Windows Laptops - Model TB3DKM2HDL

Aghana Digitals 56" Black Computer Desk with Charging Station, RGB LED Lights, Ergonomic Monitor

StarTech.com Thunderbolt 3 Mini Dock - Portable Dual Monitor Docking Station DisplayPort 4K 60Hz - TB3DKM2DPL

Targus 4Vu™ Privacy Screen for 20.1” Widescreen Monitors (16:10)

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

Quartet Adjustable Height Desktop Glass Monitor Riser with Dry-Erase Board, 14 x 10.25 x 2.5 to 5.25, White, Supports 100 lb

Mount-It! Full Motion TV Wall Mount Monitor Wall Bracket with Swivel and Articulating Tilt Arm, Fits 23 - 55 Inch LCD LED OLED Flat Screens, 66 Lbs

Mount-It! TV Wall Mount, Universal Fit for 13 - 30 in. TVs & Computer Monitors | Full Motion Tilt & Swivel 14 in. Extension Arm | Black

Mount-It! Electric Stand Up Desk Converter with Dual Monitor Arm, Motorized Desktop Standing Desk Riser with Monitor Mount for 2 Screens max 32"

Mount-It! Height Adjustable Mobile Stand Up Desk, Rolling Presentation Cart with Monitor Arm - Black

Mount-It! Height Adjustable Mobile Stand Up Desk, Rolling Presentation Cart with Monitor Arm - Grey

Mount-It! Height Adjustable Stand Up Desk Converter with Dual Monitor Arm, 47 Tabletop Standing Desk Riser w/ Gas Spring, Fits Two Monitors up to 32"

Mount-It! TV Wall Mount Bracket, Quick Release, Full Motion Swing Out Tilt Swivel, Articulating Arm Fits 19" to 42" Flat Screens and Monitors, Black