Photos importing out of order

Hello everyone

Over the last while, LR has developed an issue. When I start the import process, images are shown in the correct order, sorted by name. I even click the "sort by name"option when importing. I rename files when importing, adding a specific text phrase and a sequence number. In the past, the images would be renamed and sorted in the same order as taken. Now, even though sort by name is selected while importing, the images are imported and renamed in a random order. For example, the 199th photo might be renamed as -001,the 75th photo might be renamed as -003. This has been going on for a month or 2.

What gives?

Thanks for your help~

John