Pop-up menu problems

[Mr.Morning]

I am using a pop-up menu for a list to choose from to fill a cell on a record. What happens is that when I add new records and source data from the list, the old data will change on some of the records. Not all the records just some, like the cell is linked or something. I could handle it if it was all the records but it's only with certain records. The link is constant though, so if I change the data in the cell from the list, thoughs records that are "linked" together will constantly change. What's up with that??