I included the relevant code in my post, it’s literally just INJECT_MOD ALT - that wasn’t working at all in the web encoder. I’m escaping a Windows 10 kiosk using very hyper-specific inputs for specific applications so nobody can recreate anything except ALT, as it was the only issue I was having with the encoder.
By testing only ALT, it would strangely press WIN(GUI), CTRL, SHIFT, ALT at the same time. Using multiple keyboard testers reported it was pressing the Meta key lol.
I was able to bypass this by using a java encoder (2.6.3) and used ALT F7 in my code. Not ideal, but it worked for some reason. Seems like an encoder issue. Elsewhere online it seems like people have been having trouble with ALT combinations. Something to look into for whoever maintains the encoders.