Yes, two schools of though, one calculates UCCR (Un-Corrected Compression Ratio) and the CR (Corrected Ratio). The CR method is what you utilized to get 14/1...known as the 'Japanese Method'. Without going into a lot of detail, the CR method sounds good, seems to make sense, however; in reality is not a good measure of 'true' compression. In 'layman' terms, CR defines cutting your exhaust port roof higher as efectively reducing engine displacement (less trapped volume), when in reality a 250CC is a 250CC at 170 degrees or 200 degrees exhaust port timing.
UCCR is a 'truer' measure of compression and a much safer number to work to IMO.