由于某种原因，这封信
I changes to a 5.
J changes to 1
K changes to 2
L changes to 3
M changes to 0
N is normal
O changes to 6
P changes to *
Q is normal
R is normal
S is normal
T is normal
U changes to 4
V is normal
W is normal
X is normal
Y is normal
Z is normal
我在美国，我的戴尔 Vostro 1520 使用美国布局。这是怎么回事？我该如何解决这个问题？