"some sort of mistake" is correct and usable in written English.
You can use this phrase to refer to any mistake, either in the context of something that happened or something that may not have happened. For example, "I think I may have made some sort of mistake when I was writing my essay."
When Nicole Fischelis, the fashion director of Macy's, approached him, Mr. Aggugini thought there had been some sort of mistake.
"The consensus within the company was that that was some sort of mistake and so we're trying to not do that in the future," Schmidt said of the funding.
Speaking on the Diane Rehm show Monday, he said: "I think the consensus within the company was that that was some sort of mistake and so we're trying to not do that in the future".
This may seem like a minor flaw, but the eye picks up on divergent lines and the tapered gap at the door bottom will look like some sort of mistake.
But he said: "I think the consensus within the company was that that was some sort of mistake, and so we're trying to not do that in the future".
Ms Donnelly said she was surprised when she found out: "It was rather surreal really, I was completely shocked, I thought is this some sort of mistake?" She is now an ambassador for cultural change at the Staffordshire and Stoke-on-Trent Partnership NHS Trust and takes staff concerns directly to the chief executive.
24% involved some sort of mistaken identity.
Those debates were therefore taken to have been predicated on some sort of mistaken assumption.
Of course, it's also possible that there was some sort of error that caused an untimely mistake.
Too often last season when the Jets took the field with Sanchez under center, the question was less about whether he would make some sort of crippling mistake and more about when and how.
He said his name was Muhannad, which sounded almost funny to me, because in the past days I had heard the name "Muhammad" so many times, and it seemed that there was some sort of spelling mistake to his name.
