Merging different merges

hi, i am new user of nuke and i have a doubt. i have used furnace wire removal to remove a few wires and then merged them using merge node with ‘max’ function. i have also done some patch work to clean up the plate and then used merge node with ‘over’ function.

now the problem lies when i try merging them with a new merge node (over). i connected the ‘b’ to my main footage and ‘a1’ to patchwork merge node and ‘a2’ to wire removal merge node. the merge doesn’t show ‘a1’ and create a weird result with ‘a2’. now when i switch the function to ‘max’, then ‘a1’ starts appearing transparent and ‘a2’ works fine. i tried it vice versa.

can anyone suggest me something?? i am using nuke 6.

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