Using CSS you can change the numeric alignment. You can set a custom CSS class for the field if you want to be specific or you can just include the following CSS in your custom CSS file.
In your custom CSS file you can include the following...
/* To cover all numeric values */
.field-value input[type='Number'] {
text-align: left;
}
/* To specify a single field, note the space after the custom class */
.customFieldClass input[type='Number'] {
text-align: left;
}
For help on creating a custom CSS file see: CSS Field