If you take a pension buyout from old employer and take a portion in cash rolling over the rest do you pay penalty on the cash portion at age 58?

Was offered buyout from previous employer.  Took money in cash and rolled over the rest.  Why am I getting penalty on what was taken in cash at age 58.   I had info that you won't be subject to the additional 10% penalty if you are over 55 on a buyout.