visit number not triggered properly

Can you tell me how this is possible (Visit 2 appears two times): https://prc.parkinson.lu/subjects/subject_visit_details/84652

Even if I re-save the visit it stays as it is.

Originally requested by mail:

Dear Piotr,

Lukas and I were preparing a list of patients and found one that did visit one, that we needed for our list, but in SMASCH there was no visit listed. We tried adding it retrospectively but ended up adding two visits two but no visit one. Could you please check and change that in order to keep the statistics correct. It is ND0407 and the visit 1 was on 02. June 2017 till 6. June 2017.

Thanks a lot, Lara