Need help for i-730

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Hello All

i got my granted asylum in Aguest 2019 after 7 years .
Ater one month in september 2019 i field 4 applications i-730 for my family .thay are stil in back home country .
i am keep chacking the prosess time all the time .
in oct 2020 nabraska office chenge the porsess time to the back 4 to 5 time .
any one know whats going on?

becouse its 4 to 8 month porosess time .
but i am waiting almost 15 months .
uscis did not change my case status .

now thay jump the date in july 2020
even my case date is in 2019 september

i am so upset please help me if anybody have any information