If it is sticky, there are only two possibilities. The root cause is that the noodles are not cooked well, or not in place, or overdone. Of course, if there is too much water, it may be sticky, but I believe there is nothing wrong with the water in your formula, so I guess the noodles are not cooked well.

If it is sour, it has little to do with the degree of beating and much to do with bread fermentation. For example, if the fermentation time is too long or the fermentation temperature is too high, the baked bread will be sour. Of course, if the dairy products you use are out of date or have quality problems, there are also problems leading to this result.