Incorrect Full ammount after tax is applied

Hi,
It may be due to decimal character.
1) Do you manage devimals with point '.' or comma ',' ?
2) If on a cost value, you hit the point '.' on the numpad, does it enter a point or a comma ?

Strange. I could not reproduce the behavior showed on video.
For me, after refresh, amount is still 399,75.
Could you please replay the two questions on previous post ?

) Do you manage devimals with point '.' or comma ',' ?
2) If on a cost value, you hit the point '.' on the numpad, does it enter a point or a comma ?

Could you also please try and reproduce on Demo so that we has a test case ?

And numpad point on cost fields (for instance on validated cost on Activity), does it enters point '.' or comma ',' ?