What's up with my eye view?

Whenever I get in to a server of any kind, my eye view is lower than the map ground. But, when some looks at me, I look normal. So, what happened? And how can I fix it?

I’m guessing the 30 people who saw this, have absolutely no idea what I’m talking about. It’s like when you noclip under the map, and you see the bottom of the map but still can see the top of the map too. But this is happening all the time, when I enter an online game. Can anyone help me?

Don’t turn upside down? lol

Rename your Garrysmod folder to garrysmodold or something like that. then start up garrys mod. see if that helps