Hi, I am having an issue with fields type number. It is only accepting value equals to zero. If you insert a value greater than zero it displays a message asking you to put a value lower than or equals to zero. The similar is occurring when you put a value lower than zero. However, it displays a message asking you to put a value greater than or equals to zero.
Are you using a custom theme?
Is it possible that there is a custom function hooked to the acf/validate_field filter that is interfering with normal validation of the field type?
Can you replicate this issue on one of the stock WP themes?
Thanks, it seems to be a theme problem. I have tested in a stock installation and it is everything ok.