That's a wonderful eggcorn.

I was watching a video talking about how eggcorns are an unusual category of error because they require intelligence and creativity to make. The argument was that the process goes like this:

A new word or phrase is heard, but not understood. The brain makes sense of it using existing vocabulary that has sounds that are close enough. This is accompanied an explanation for why those specific words make sense in this new context.

For example: the original eggcorn was a mishearing of acorn. Egg because it's roughly egg shaped, and corn is sometimes used to describe small objects similar to how grain can be.

All this to say, it's maybe not something to feel dumb about. Your brain did something neat.