Import images problem

My TBH had failed to import properly with rendered images name such as preview-07244594d4600188-1.tga, preview-07244594d4600188-2.tga,

The results of the imported images were out of synchronization.

After numerous of failed attempts, I decided to rename the rendered images to test-001.tga, test-002.tga, test-002.tga…test-102.tga.
and suddenly it works.

Does the TBH’s import images has a sensitive naming convention?