Filtering data and precision during calculations

[Scientifix]

Hello everyone,

I am currently working on a project which requires me to find the minimum of two fonctions.
The problem is that the process generating the data seems very very sensitive (see photos, step = 1e-6) :



So I have two questions :

1/ Do you think that the "V" and the "horizontal line" for both graph are due to a lack of precision when performing calculations (generating process is complicated and has a lot of steps)

2/ How would you filter the data to only keep the "V"

Thanks in advance,
Best