Jason, I had the same problem...and after contacting the company, I just opted to use the lids on my tubs and just put some air holes in side of tubs...

With the lids on they slide in perfectly and are the tightness I wish they would be without the lids but that's the way it goes..

I see now they make a special tub to make a pefect fit, but the price is too high for my wallet. It may just be certain tub production plants make them shorter or taller...because I have seen some that fit perfectly. I feel your pain. Andy Federico
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