Player won't jump and run to the right at the same time - basic platformer

https://drive.google.com/file/d/1yeiMiXrGXnp1VPr2jGjq1b0eCzbfLKnu/view?usp=share_link

The player has default keyboard controls so left and right to walk, and up to jump.

When "A" is held down, the platformer max speed increases. However, when the player is running, it only responds to jumping when running left. If the player is running to the right and jump is pressed, the player won't jump.

It works for me.

Your keyboard may not support certain key combinations. See this link:

microsoft.com/applied-sciences/projects/anti-ghosting-demo

Thanks, I’ll try that keyboard test. Are there particular brands or types of keyboards to use for gamedev/play testing? I’m guessing controllers are more reliable, whether a basic Logitech or Xbox controller, etc.

The test seems to indicate that the problem is with my keyboard.

When "A", "left," and "up" are down simultaneously, it shows that 3 keys are down.

But when "A", "right," and "up" are used, it shows that only 2 keys are down.

It's a simple Dell keyboard that came with the desktop computer.

I've had this problem with trying a basic 8-directional type game as well. It would be nice if there were some guide to know which keyboards/control setups won't work for basic gaming with simultaneously pressed keys.