Hot water coming from cold side tap even though hot water supply shut off
Hi I been having problem for past year now hot water comes from the cold side tap, I only have 1 tap that shares water hot and cold the other 2 I have are 2 separate hot cold and 2 are just cold taps now I have even shut the cold water supply to the hot water tank off, but yet when I run the cold water side I get the regular water coming through then 15 seconds into it I get hot water and then goes back to cold
How is the hot water coming out? When the tap to the supply line is shut off and if I open the shut off taps to the hot water side for the sinks no water comes out but yet I still get hot water on the cold side
I stumped any one have ideas?