I observed that too on myself (English is my second language), and I even wrote comments like that in the past, but after 20 years I noticed that I started making those errors myself, which sucks.

I'm guessing when you read people making this mistake over and over (I even saw it done in news articles) I guess your brain starts equating them together :(

I'm thankful for those people correcting it, although I think it is a losing battle.