When Auto-indent is disabled, entering a closing bracket '}' will delete all tabs that have been entered on that line previous to it if that closing bracket would otherwise have been auto-indented.
It may also be helpful to note that I have soft tabs disabled and match brackets also disabled. This does not happen when tabs are set to insert a truckload of spaces instead of a tab.
On some occasions, it will not eat all previous tabs and instead auto indent anyway (even though it is disabled), replacing my tabs with a bunch of spaces.
Basically, disabling auto indent doesn't work.