Sellers noticed that their Stores are displaying inconsistent counts of the numbers of items in their individual Stores.
"eBay can't make up its mind whether my store should have 189 or 136 items. (should be 189). When I flip through my 7 store pages, everything seems OK and it shows 189 items until I get to page 5. Then all the sudden it shows 136 items and only 5 pages. And then again, once in awhile it doesn't," wrote Primsaw.
Other sellers chimed to say they also saw the problem, and Begah wrote, "I'm having the same problem. You'd be interested to also know that when they magically disappear from our stores, they are also magically disappearing from search as well!"
A screenshot of Primsaw's Store items follow - it shows "page 7 of 5" with 137 items. The first page had said "191 items found in All Categories."

The thread began on Wednesday evening in the eBay Stores discussion board with the title, "Glitch of the day. Store losing and regaining items at light speed."
Update: 3/6/08: I received an email this evening from Ajay Agrawal, Director of eBay Product Development, stating that the problem is now fixed.