glitich in the outputs

Are you driving the output from a combinatorial block? When the inputs to a combinatorial block change, the data propagates through the block and can cause glitches on the output prior to settling.

You can either inforce state mapping on your input to prevent this or put a register on the output.

Creating state mappings and custom logic to prevent glitches doesn't always work because Quartus tends to optimize them out. Registering the output always works but you have to have a clock in your design and the output will be one clock cycle late.