Can't tell much from your pics . Are the mating surfaces of the isolation valve and the hose clean and flat ? If so ,are you tightening up sufficiently when fitting the hose onto the valve ?
Yes clean and flat. Trying to tighten sufficiently without over tightening. The problem is you’ve got to do some jiggery pokery to connect due to angle of isolator/supply.
Another picture. Looks fine to me. Have noticed that the old washer sits more snugly in the hose. Ie the lugs secure under the ridges on the hose etc. The new one just falls out easily.
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