Down payment clearing with with holding tax

hi,

we have a down payment in f-48

Down payment 10000

vendor               9000

tds                      100

invoice f-43

expence        100000

vendor            90000

tds                 10000

clearing f-54

vendor              9899

down payment  10000

tds                   101

In production I am getting the above entry in f-54

in quality everything is fine

What is the probability of change in tds amount like above ?