When the XOR gate in KTechLab has more than 2 inputs, it only returns true when 1 input is true. If 3 inputs or 5 inputs are true, it returns false, when it should return true. (I did not test more than 5 inputs, as it is unlikely that such a gate would ever be used.)
XOR gates with more than 2 inputs are supposed to return true when an odd number of inputs are true.
Note that XNOR gates behave similarly.