table 7.5 perfectly reproduced, table 7.6 has errors

Table 7.5 has been perfectly reproduced.

However, it seems that table 7.6 has errors in column yhat.
I guess maybe the initial level trend and season have other values at other digit positions after tenth, and multiplicative method is very sensitive to the small numerical deviations. But, currently I am unable to dig out the problem. It seems the function has no problem and it is only the table’s problem.