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ADC INJECTED Wrong values reading

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Hello everyone
i have a question, i am using 3 Ranks ADC injected mode for reading potential resistors.. with stm32f103c8
the problem is when ever i change one value it affects the other channel reading.

example

channel 1 reading is 1.3v

channel 2 reading is 1.5v

channel 3 reading is 1.6v

changing only resistor value on channel 1 to 2.9v makes the following:

channel 1 reading is 2.9v

channel 2 reading is 1.7v

channel 3 reading is 1.7v

why when i change one value the others are...

ADC INJECTED Wrong values reading

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