VRF COP is increasing during summer!!

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Hello everyone

I have modeled VRF using E+ but when calculating the cop from the output:variable it seems that its increasing during summer!

Anyone knows why ?

Thanks VRF HEAT PUMP COP (J) January 2.195804987 February 2.683865027 March 2.954294954 April 3.138574206 May 3.438156796 June 3.701257021 July 3.686762991 August 3.614135836 September 3.914780598 October 3.479610967 November 3.215406899 December 2.636814515