SVG Saved from Illustrator is messed up when opened in plot program

What vinyl cutting application are you using? Depending on the application you might have to save the SVG file in a different file format.

For example, I ran into an issue with Onyx Thrive a while back. With print and cut operations I can use PDF files with cut paths where the stroke is given a custom spot color name "CutContour." For cut-only tasks Onyx wants SVG files. Previously I could use default settings from Illustrator. But those stopped working. I had to experiment, saving SVG files in various formats until SVG Tiny 1.1 did the trick. They'll probably change something with an update and I'll have to do the whole experimenting thing all over again.

What is your system and Illustrator version number? Also, based on your screen grab, you used teh "Save As.." approach o save your SVG.  Have you tried "Export As..." SVG instead to see if you get different results?

If you can upload the illustrator file here, I can compare my results.

Don't know exactly what is going on there without seeing the Illustrator document, but it's interesting it's affecting certain shapes exactly the same way each time, like your T shapes.

But a couple of things I noticed in your settings you might want to change

1. Increase your decimal places. A setting of "1" one will cause poor quality curves. especially on small objects. Curves will render better the higher you set this (3 or 4 is a good level that will match Illustrator's native accuracy).

2. All it's usually recommended to check the Output fewer elements (to reduce file size), I'd leave it unchecked if you are moving this to a plotter. I suspect file size is not an important aspect for you.

Try a higher decimals setting, like 4 or 5