Uneven Negative Development

I have a problem that seems to come and go and is very perplexing. Sometimes when I develop film certain segments of the roll and the exposures in that segment seem to receive different development. The most recent problem this evening showed up where half the negative was lighter. It occurred on exposures 1 through 5 and the others were untouched. I shoot a Mamiya 7 almost always loaded with Tri-x. I always develop in HC-110. My process has been the same for a long time. I always develop 2 rolls of 120 at the same time in a small tank. I do pour the developer through the top of the tank through the filler hole. Should I leave the top off and immerse the rolls in the developer in one fell swoop? This problem happens sporadically. Several times a year I will load the camera with color film and have the lab process it. No problem! At this time I believe that the problem is my process. As I mentioned above I pour the developer in through the top of the tank and I do not stop pouring until all the developer is in the tank. I would think that any lines or uneven development would occur across the films 6mm dimension but the lines of uneven development actually occur in the 7mm dimension. This I can not figure out! Any help would be greatly appreciated.

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