I'm not an expert of regex, but It seems to me the regex validation pattern for the decimals should be reviewed.

for example the decimal10,2 by default from the builder is:

^d{0,8}(.d{0,2})?$

but it's wrong, it should be:

^\d{0,8}(\.\d{0,2})?$

I think it is fixed now.

During the migration I have lost the '\' of the regex. I had to check them all, but I am not expert in that.

@All users : Cook furnish you some Regex as examples.

To try again, you must unset the validator, and set it again (in the field properties)

yes, it is fixed now, thanks