Prestashop Problems saving features

[Roberto Remondini]

Hi everybody,

I had to increase the size of the features on my Prestashop 1.7.6.8 field. To do it I've changed column value on ps_feature_value_lang to varchar(1024) and after modify size in override/classes/FeatureValue.php to: 'size' => 1024

But I have this problem: every times I save the product, when I re-enter to modify it, the features lines are double than last time.

Each save pass for example from 2 features to 4, 8, 16, 32 ect. It have custom value strings but doesn't have selected function.

If I try to delete I have no result, on save featured double up anyway.

Thanks