[SOLVED] Leave right doubled after changing year

Hi,

I wish you a very good 2021! Hope it will be a better year for everyone.

I have a problem appeared after we've change the year.

All of our employees have CDI contracts like this :
 
From one of them :
 

And when we entered in 2021, they got twice the leave right for RTT, and I can't understand why. 
 

Is my configuration right? Or shall I change something?

Thank you for your help.

Regards,
MCanuto

P.S.: In version 8.6.3, but also in version 9.0.0 (our test environment)
 

Hello, 

thank's and happy new year too ! 
Ther is an issue, ticket #5161 has recorded on roadMap. 
You should to remove duplicates manually while waiting for a fix