loses "0" at the beginning bug?

[Aaqu]

Hi I am new in modbus my problem is I use readInputRegisters. I must connect hex to 2 byte and parse ieee 754 (hex to dec).
String in value not contain 0 at the beginning(bold text)

value parsed to hex from response
[
'31a8', '41c1', '9db0', '41ca',
'ffff', 'ffff', 'ffff', 'ffff',
'ffd8', '439c', '4558', '439c',
'cbe8', '439d', '48d0', '41bf',
'ffff', 'ffff', 'ffff', 'ffff',
'ffff', 'ffff', 'd9f8', '41ac',
'7898', '41ab', 'd1e0', '439c',
'698', '41b1', '608', '41b9'
]

Buffer to hex string
31a841c19db041caffffffffffffffffffd8439c4558439ccbe8439d48d041bfffffffffffffffffffffffffd9f841ac789841abd1e0439c069841b1060841b9