Unable to adjust label spacing or field contents position next to label

When laying out my form I'm unable to adjust the position of the field contents of a number of fields relative to their labels and I'm not sure what I've done wrong.

One field that is affected is {2ndDogBreed} it should be laid out the same way as {1stDogBreed} so the dropdown entry box doesn't overlap the edge of the shaded form column.

I've tried selecting the field in design mode but there are no options to change the width of the field entry or the spacing relative to the associated label.

Just wondering if some rogue CSS has crept in somewhere?

Other fields are affected but if I know how I fix it I can sort those too.

Many thanks

Simon