If this is generation 5, (Black/White and their sequels) then you likely bred a father with Strength. HM and TM moves are still passed down to the baby in gen 5, unlike in gen 6 (XY). It has been that way since gen 2 (Gold Silver Crystal). It's been a general rule of thumb until X and Y.
Source(s): I've bred Pokemon for 10 years, I learned this in Ruby and Sapphire.