^^^^^ Yep. I believe this is #4, that I can think of right off the top of my head.
Not saying that 'Wix' as a company or their products are bad, but it seems some number of filters have caused problems for their consumers. ANY company can experience such things as 'bad runs' or a few items getting out the door not up to 'spec'.
So...what I look to, is what does the company do about it once consumers come forth with a complaint.
The other thing that is a bit troubling....is that if 3-4 of our members have had issues (if legit), we represent a very small part of the buying public that use those model Wix filters. So....the problem (if it truly exists) is on a larger scale than just reported here.
Personally, I run Motorcraft filters (made by Purolator) on all of my vehicles...including my Toyota's. Easy to find, priced right, work great...always.
To the OP: I would encourage you to contact Wix and go through the procedure to have the 'suspect' filter tested.