Problems with water tank emersion tank system pump fitted to hot water?

hi i have a gravity fed water system with a hot water cylinder. i have fitted a pump to the hot water as this was poor pressure. the bathroom is fed by the cold tank in the loft and hot by the cylinder with pump installed. but when i have a shower the hot overides the cold and i have boiling hot water only. i have mixer taps and when i run the bath its fine the water mixes but as soon as i turn the shower on only hot comes out any ideas on what to do thanks

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