VBA always show a black box when I type ", ', or `

I use Excel for Mac and every time I'm coding and I type quotes (" and '), acute accent (é, ó, í, ú), caret (ˆ) or backtick (`) it automatically opens this black box with green borders and everything you type stays inside that box until I hit enter.

When I'm typing in that box and I click on any corner of the screen, it DELETES what I was writing.

As you can see, it's pretty annoying.

Do you guys know how to fix it?

I contacted Microsoft and they don't know how to fix it.

Thanks.