What is the procedure you followed in adding these new fields?
Have you added these new fields inside acf-metaboxes.php ?
If this is the case then it is very crucial that the IDs of these new fields to be unique.
For example “field_562a457b33100”.
You can generate unique strings with PHP function uniqid();
In the name it’s best if you keep it as simple as you can, remove the special characters, for example : Omsättningskrav -> omsattningskrav
Also change in all three fields from ‘type’ => ‘number’ to ‘type’ => ‘text’
Lastly the keys are created with uniqid() ? Because it is very important for these fields to be unique.
You can try an online parser like http://www.writephponline.com/ and you can run the uniqid();
The main issues for not saving the data in custom fields are the IDs to be unique and the names to be valid.
and try creating your fields with the Visual tool of ACF, if you still experience the same problems then indeed is something with the server configuration, if everything is saved correctly then you are doing something wrong in acf-metaboxes.php