In addition to jkleidou, It will also depend of the size/grid size you use to build your symbol in Capital Symbol. Then, if the Symbol grid size in Capital Symbol is the same than your design Grid size, they will be matching. Otherwise the symbol will be enlarged or reduced by the ratio you have between the 2 grid size.
Also, is it an Electrical Symbol or Comment Symbol?
Sounds like you having the drawing set to metric or imperial/english units that would give you a scale difference of 25.4