It was my understanding that bleach use would eventually cause PH to rise, but will it also increase Alk?

A few weeks ago I had my Alk down to 150. Tested my fill water, and it's 320. I had to add a few inches of water, alk went to 180. Just tested again today, PH is 8.2 and Alk is 250.

I've only added bleach to my pool, at the rate of .75 gal of 6% per night in my 21,200 IG pool.

Do you think the bleach is what's causing my alk to rise so fast? I've added muratic acid this afternoon, hope to again drop the alk and aerate as needed. Since high alk seems to be a continuing "problem" (is it really in a vinyl lined pool without SWG and/or heater?), I plan to try to get my alk down to 100.