I have a currency field but when I try to print it in PDF ${record.custrecord_ci_amount} it shows me just number. To make things worse, if I output ${record.custrecord_ci_amount?string.currency} it shows nothing. Any help would be appreciated

Try

${nsformat_currency(record.custrecord_ci_amount)}

This should show the value in the correct currency format and symbol for the associated currency to the record - which I'm assuming there is? If the field type is already currency then I would expect this to carry through to the PDF but without further context I can't provide any additional comment.

just sec please

Do you have additional formatting on the date field?

${record.custrecord_due_date} which is Date field but it shows TZ string and if I print it ${record.custrecord_due_date?date} it shows nothing.

Have you tried the string built-in on this page with the format you want? https://freemarker.apache.org/docs/ref_builtins_date.html#ref_builtin_date_datetype

this one works though. ${.now?date}

I mean for that date field, e.g.

${record.custrecord_due_date?string["dd/MM/yy"]}

yes but it shows nothing

And without formatting it shows a string value?

without formatting it shows this value

And the field type is definitely Date or Date/Time?

Yes it's Date

Not certain, I can't think of any reason I've come across before why you would be having issues with these fields based on the information you've provided