If someone hasn't stated it before, welcome to posting on the Zen Cart forum. Thing is, with regards to your issue ( or any issue to be posted about) there is information that is needed in order to properly frame the situation. This basic information is identified in the posting guidelines that typically appear above the text block to post a message. Also, the "everywhere read" aspect indicating the expectation of two sets of numbers should be identified so that they can be used as a reference point or to maybe get corrected.
I have a 1.5.1 site that was built from the ZC available download section, that also has a single block for entry of the next order number. I haven't tried it in a long time, but I don't recall there being an issue. There is a work around (or several) to set it, but that doesn't truly fix the problem you are having. Further depending on the answers to the questions of the posting guidelines, there may be other issues that just haven't yet been identified.
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