Seachem flourish & continuum elements t ph puzzle

Hi all, my tank has been holding at 7.2 pH for weeks now. In the last wc I added two additional chemicals to my aged water mix along with continuum reconstitute (using mix of 80% RO and 20% bore) and Seachem neutral regulator. Prior to changing checked the aged water and it had risen from 7.2 to 8 ppm. Dosed the change water with neutral reg and acid reg and could only get it to 7.3, not much of a diff and as had already taken out 50% of tank water so did change. Over two days pH in tank and in aged bounced up to 7.6. Added acid reg to tank sump and age barrel, pH lowered y/day to 7.2 in both. This morning pH at 7.5 in tank and 7.7 in aged water. Can flourish or elements t cause a pH rise? Have added nothing else to bb tank except an Amazon sword to a driftwood that I've had in there since start