Error in importing Free Text Import association with correct Class

[valdisj]

We have established following classes:
Id | Class | Course
9 | S16 | V16 S16 S Vidējā
10 | V16 | V16 S16 S Vidējā
11 | S OPEN | V14 S14 OPEN
12 | V OPEN | V14 S14 OPEN
13 | S Senioru | Senioru
14 | V Senioru | Senioru
15 | S Vidējā | V16 S16 S Vidējā
16 | V Vidējā | V Vidējā S Garā

We have following sample of runners:
Name | Club | Class | SI
Random Name 1 | Siguldas Sporta skola | V12 | 8506775
Random Name 2 | A2 | S Vidējā | 8665505
Random Name 3 | Siguldas sporta skola | S12 | 8665507
Random Name 4 | Siguldas sporta skola | V Senioru | 8665508
Random Name 5 | Siguldas sporta skola | V12 | 8013455
Random Name 6 | Kaupietis | S OPEN | 8657225
Random Name 7 | Ozons | S16 | 8013452
Random Name 8 | Individuāli | V Senioru | 8142179
Random Name 9 | Siguldas Takas | S Vidējā | 8142171
Random Name 10 | Siguldas Takss | V Garā | 8010996
Random Name 11 | Individuāli | S Vidējā | 8133265

When importing using Free text import, MeOS associates all runners correctely to correct Classes, but always EXCEPT all who are registered as "S Videja" class runners. These are always somehow associated with class "V Senioru". We cannot understand, why this is so. Multiple tries, no luck in understaing cause of the issue. Our thinking is, that may be MeOS free text import tries to search something in Class name, but fails to link with correct class name. In Free text import even Preview shows that association is correct "S Videja", but then, after clicking "Save entries" in Free Text Preview, in competitors list they always show up as "V Senioru" class, which is totally incorrect.

Attached are screenshots: