You may be pulling from different influences because of different things that are going on in your life, different people that are around you and more experiences to pull from.
Languages are something of a mess. They evolve over centuries through an unplanned, democratic process that leaves them teeming with irregularities, quirks, and words like 'knight.'
A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.