I'm going to have to say that some of the material from the earlier Steps -- Dee and Lisa's, at least, and maybe Sana's -- was reconstructed later somehow and may be less complete than the data from the later girls' worlds. The first few girls had no reason to think that they're not "close" to Warriors' World initially, and wouldn't have a reason to be carrying archives with them. Dee, in particular, thought she was merely hopping over to WW for just a couple days to recruit Doug and his friends for the Hardorn War; she wasn't expecting to find herself on a Grand Tour. By they time they got to Buckaroo Banzai's timeline they will have realized that they're not reaching WW soon, and that's probably when they decided to pool their info. Maybe the goddesses helped them extract and collate the earlier stuff when they reached DW5... might also be where they got their storage medium, whatever it is.
-- Bob
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Then the horns kicked in...
...and my shoes began to squeak.
-- Bob
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Then the horns kicked in...
...and my shoes began to squeak.