I just submitted an application today with 3/20 independent/total claims; when uploaded, Patent Center flagged it as having 4/20 independent/total claims. It then filled out the fees due according to this claim count. The culprit was claim 3, which recited:
3. The apparatus of either claim 1, wherein the.... (substantive material omitted since not public; underlining was added for this post).
The claim had started out as a multiple-dependent, but was edited to be single-dependent prior to filing. The "either," however, inadvertently remained, which seemed to cause this error. When corrected, Patent Center properly evaluated the claims as having 3/20 independent/total claims.
It seems like a rather odd error, as one would think that the parsing system would simply look for "claim" followed by a number in a claim (or claim preamble) to determine if claim was independent or dependent. The presence of an "either" in front of "claim" shouldn't really affect this.