Yes from where i stand it should be counted as 3 years, but the thing is on the system when you fill the application you say from which month to which month you have been working and based on that it calculates the years so it doesnt calculate the hours at least on the online system. However, when you upload the reference letter, it mentions there the.number of hours so maybe them the IRCC officer recalculates the experience based on what he sees. This is why i am telling you from what i think its a matter of the officers judgment.
Yes tag them.in the question or better yet start a private conversation with them and please do let me know what they say.
Best of luck