Anime missing episode

Server Version : 1.28.2.6106-7000 (Synology)
Player Version : 9.7.0.34811 (Android)

Hello,
I have a strange problem.
Usually everything is fine but for an anime that is well recognized and I corrected the association only 4 episodes are detected on the 13. Is there any unrecognized format that would disturb?

Make sure the episodes are numbered as SxxExx, even if there is only one season.

there is only one season so I did not specify in the file name but there is the episode number.
it’s the same structure for all but only 4 are displayed

Finally my problem is solved. The episodes from 1 to 9 were indicated in the wrong format after modification by 04 instead of 4 everything is ok