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As the title says. If you tab too many times, backspace should delete 2 spaces instead of just one (in the case of tabs).
What are you indentation settings? (tab size, spaces per indent, expand tabs to space etc...)
Pressing <tab> inserts spaces/tabs depending on your indentation settings. Pressing backspace always removes the character that is on the left hand side of the caret. This is an intentional behavior. If I misunderstood this report please reopen and explain what the problem is or add steps how it can be reproduced.
I think (but am not sure) this user was having the same problem I am experiencing that led me to this bug report via Google. Basically, in some other IDEs like Eclipse, if you are using spaces rather than tabs, then hitting backspace at the beginning of a line automatically deletes a tab's worth of spaces (4, 8, whatever the setting is). Netbeans, however, deletes only one space. So if you are used to the Eclipse-style workflow, you hit <tab> once to indent, but hit <backspace>, e.g., 4 times to dedent. I don't know that this is really a bug any more than Netbeans using Ctrl-E for Elide Line rather than Ctrl-D for Delete Line. The answer, for future Googlers, is to use shift-tab to dedent, which does what is expected.
Exactly as the previous comment says - the problem is that netbeans don't delete appropriate amount of spaces if indentation is set to spaces when pressing backspace.