Yesterday I received all the receipt numbers for all the forms filed from AOS. I went to enter all 9 into my case tracker soI can keep an eye on them. All of them came up except one, which is for one of the I-485s (i had K1, and 2 K2s), when I type in the receipt number it says, “The receipt number entered is invalid.” I also tried entering into the uscis website directly and got a similar response. Should I be concerned, or try to contact USCIS about it? I double, and triple checked and I am entering it exactly as it was given to me.