Alkalinity drops too low on new water fill

When I'm adjusting the ph to balance the water in the tub the alkalinity drops to below 50 before I can get the ph to stop drifting. I know that alkalinity is a ph booster how do I keep the alkalinity up around 50 while I still have to use ph down to get the ph to stop drifting.
 
Please post a full set of test results: PH, TA, CH, CYA

How high does the PH get? With low TA, it should not get that high.
 
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