It shouldn't have done. What system is this?
Michael
I have had something similar for the last couple of days in Delta Phoenicis/ Sandage Terminal where I have been logging off each night/ starting from. On logging in I have been checking prices to update Slopey's BPC (hence easy to notice the changes). If the price list was 'A' the day before on checking "today" I see that roughly 75% have changed (far more than usual), so I update to list 'B'. Flying off to another system and back and the list has (edit: usually, see below) gone to 'C' with only one or two changes to prices from 'A' as would be expected. Logging out and back in before changing system doesn't alter it from 'B'.
I've just logged on today and it seems to have happened again- to use one example Performance Enhancers is showing as 6,856/ 7,000 (B) (I remember that round number being there both times before) when yesterday it was 6,766/ 6,908 (A). I've now flown to Erlik and back and they are showing as ...the same

I've now flown back to Erlik, logged off, back in, back to Sandage Terminal and now they are back to what I expected: 6,766/ 6,908 (C). I logged off/ back in at Sandage Terminal after the first trip to Erlik and the prices stayed at the wrong figure.
For list B today again roughly 75% had changed from yesterday's A list. After getting it to the (I assume correct) C list only one commodity has changed price from the A list, Beryllium (which is what I have been selling).