Shortcuts don't work

I’m quite new to Scrivener and have edited a few of the shortcuts so that they are more intuitive for me. For example, “tab” to create an indent, and “shift+tab” to remove an indent. I’ve made sure they are all unique. When I try and use them while writing, several of them worked the first time and then stopped working. Now if I hit “shift tab”, it creates an indent - the opposite of what I wanted to do! Can anyone help?