I heard this yesterday on HGTV’s “Design on a Dime” television program.

Problem:
The verb “lie” is incorrect for this sentence.

Explanation:
The verb “lie” — when it means to be in a horizontal position — is an intransitive verb.

So one cannot “lie them down”.

“Lay” is the correct verb for this sentence.

I believe that the use of “lie” in this sentence is an example of hypercorrection. The speaker of the sentence probably knew that “lay” is used too often as an incorrect substitute for “lie”, so she chose “lie” when “lay” actually was the correct verb.

Solution:
“I’m actually going to lay them down.”